Collagen fibers are fibrous proteins and are secreted into the extracellular space and they provide high tensile strength to the matrix. The primary tissue of bone, osseous tissue, is a relatively hard and lightweight composite material, formed mostly of calcium phosphate in the chemical arrangement termed calcium hydroxylapatite. B: Fibroblasts are the cells that produce collagen and elastin that form the fibers found in connective tissue. Purkinje fibers are specialized muscle fibers. Connective tissue can be sub-classified into connective tissue proper, specialized connective tissue and embryonic connective tissue. Purkinje fibers are specialized muscle fibers. Cartilage is a flexible connective tissue found in many areas in the bodies of humans and other animals, including the joints between bones, the rib cage, the ear, the nose, the elbow, the knee, the ankle, the bronchial tubes, and the intervertebral discs. Collagenous connective tissue is divided into two types, based upon the ratio of collagen fibers to ground substance: Loose (areolar connective tissue) is the most abundant form of collagenous connective tissue. The most abundant fiber in connective tissues is a tough protein called collagen. This is especially seen in the arterial blood vessels and walls of the bronchial tubes. It is an atypical connective tissue since it does not bind, connect, or network with any body cells. Dense connective tissue – also called dense fibrous tissue 4. Blood is a bodily fluid in animals that delivers necessary substances, such as nutrients and oxygen, to the cells and transports metabolic waste products away from those same cells. Fats/bones Cartilage is avascular, while dense connective tissue is poorly vascularized. Mast cells also secrete heparin, SRS-A (slow reacting substance of anaphylaxis, ECF-A (eosinophilic chemotactic factor of anaphylaxis. It is part of the skin dermis area and in the joint capsules of the limbs. False. It occurs in small, elongated bundles separated by regions that contain ground substance. Reticular fibers are short, fine collagenous fibers that can branch extensively to form a delicate network. It holds organs in place and attaches epithelial tissue to other underlying tissues. Cartilage – less hard and more flexible than bone. Connective tissue has three main components: cells, fibers, and ground substance. Its main role is to store energy in the form of lipids, although it also cushions and insulates the body. What layer(s) of the skin are blood vessels found within? reticular. Which is the most abundant fiber in connective tissue? General Biology/Tissues and Systems/Connective Tissue. Collagen fibers are the most abundant CT fibers. 3. 7. 8. d. Mucous connective tissue Purkinje fibers are seen in the heart. Wharton's jelly is mucous connective tissue. This is loose connective tissue composed of adipocytes. The most abundant fiber in connective tissues is a tough protein called collagen. Purkinje fibers are seen in the heart. The osseous tissue is relatively hard and lightweight in nature. a. Fibroblast Like to the timber framing of a house, the connective tissue provides structure and support throughout the body. (adsbygoogle = window.adsbygoogle || []).push({}); Connective tissue is incredibly diverse and contributes to energy storage, the protection of organs, and the body’s structural integrity. Which of the following would be best suited to visualize reticular fibers? The ground substance functions as a molecular sieve for substances to travel between blood capillaries and cells. Its function is to maintain the shape of the structure while allowing flexibility. Mast cells secrete histamine. Image Source: austincc.edu. What is areolar tissue? Collagen: Collagen fibers are the strongest and most abundant of all the connective tissue fibers. Bones Storage – (energy, electrolytes) -- Ex. The most abundant cell in connective tissue proper is the fibroblast. c. Histiocyte This histology test bank is also useful for the histology questions on the USMLE (USMLE step 1). Primary tissue of the dermis Match the following type of connective tissue fiber with its description: Collagen fibers The strongest and most abundant fibers, they allow connective tissues to resist tension. d. Multilocular adipose tissue Its matrix appears transparent or glassy when viewed under a microscope. a. As the name implies, connective tissue serves a connecting function: It supports and binds other tissues in the body. Author: Rachel Baxter BSc, MSc • Reviewer: Uruj Zehra MBBS, MPhil, PhD Last reviewed: October 29, 2020 Reading time: 7 minutes Connective tissue is mainly a supporting tissue that binds and supports organs and the body as a whole. Plasma cells are derived from B lymphocytes. Connective tissue is classified into two subtypes: soft and specialized connective tissue. Collagen fibers:They are tough, thick and non-branching fibers. The fibroblast also produces the ground substance in connective tissue. a. Adipose tissue Classification of Connective Tissue. e. Mast cell. When a body region is inflamed, the areolar tissue in the area soaks up the excess fluid as a sponge and the affected area swells and becomes puffy, a condition called edema. Brown adipose tissue Which is the most abundant fiber in connective tissue? In vertebrates, it is composed of blood cells suspended in a liquid called blood plasma. Connective Tissue Found everywhere in the body Includes the most abundant and widely distributed tissues Functions of CT Binds body tissues together (Binding of organs -- Ex. Connective tissue is divided into four main categories: Connective tissue proper has two subclasses: loose and dense. Which connective tissue cell type produces collagen? c. Reticular fiber Fibroblasts, histiocytes, plasma cells, and mast cells are routinely seen in loose connective tissue. It is mostly formed of calcium phosphate in the chemical arrangement termed calcium hydroxyapatite, which gives bones their rigidity. It is made up of blood cells and is surrounded by a nonliving fluid called plasma. There are three types of fibers found in connective tissue: collagen fibers, elastic fibers, and reticular fibers. It is composed of proteoglycans and cell adhesion proteins that allow the connective tissue to act as glue for the cells to attach to the matrix. Adipose tissue: Yellow adipose tissue in paraffin section with lipids washed out. This tissue gives bones their smooth, white, and solid appearance, and accounts for 80% of the total bone mass of an adult skeleton. Tendons, … Fibers of Connective Tissue. a. Mucous connective tissue Three types of fibers are found in connective tissue: Collagen: Collagen fibers are the strongest and most abundant of all the connective tissue fibers. c. Histiocyte In humans, adipose tissue is located beneath the skin (subcutaneous fat), around internal organs (visceral fat), in bone marrow (yellow bone marrow), and in breast tissue. It is found in the external ear (known as an auricle) and in the epiglottis. Tendons, ligaments, and the white stringy tissue (fascia) seen in some cuts of meat are composed almost entirely of collagen, as is leather, which consists of the connective tissue layer (dermis) of animal skins. Loose connective tissue is divided into 1) areolar, 2) adipose, 3) This is present during fetal development and then decreases after birth. The main fibers that form this tissue are elastic in nature. Key Points: Connective tissue is the most abundant and widely distributed of the primary tissues. Mast cells secrete histamine. They are the strongest and provide high tensile strength (that is the ability to resist longitudinal stress), stress test shows that collagen fibers are stronger than steel fibers of the same size. From the most rigid to softest, the major connective tissue classes are the following: 1. e. Mast cell. Most abundant are the fibres composed of the protein collagen. It is an undifferentiated tissue found in the embryo. Click again to see term . Loose connective tissue White adipose tissue Its porosity is 5–30%. 2. It is comprised of cells and extracellular matrix, including fibers and ground substance. Together the ground substance and fibers make up the extracellular matrix. c. Blood Tap again to see term . Adipose tissue or body fat is loose connective tissue composed of adipocytes. Tap card to see definition . Hematoxylin and eosin stain is the most commonly used tissue stain for routine histological examination. They help the connective tissue to stretch and recoil. Mesenchyme is embryonic connective tissue. Top of Page. b. Mesenchyme A peripheral blood smear would be best visualized with Wright's stain. c. Loose irregular connective tissue There are three types of protein fibers; collagen, elastic and reticular. Connective Tissue Types • Hyaline cartilage • Most common cartilage • Composed of: • Abundant collagen fibers • Rubbery matrix • Entire fetal skeleton is hyaline cartilage Figure 3.19b Connective Tissue Types • Elastic cartilage • Provides elasticity • Example: supports the external ear Connective tissue proper consists of loose irregular connective tissue and dense connective tissue (regular and irregular). The histiocyte is a connective tissue macrophage. With the tensile strength of collagen, this tissue forms tendons, aponeurosis and ligaments. Polysaccharides and proteins secreted by fibroblasts combine with extra-cellular fluids to produce a viscous ground substance that, with embedded fibrous proteins, forms the extra-cellular matrix. These tissues are widely distributed and serve as a universal packing material between other tissues. Connective tissue fibers provide support. Connective Tissue Proper . b. Myofibroblast What type of adipose tissue tends to decrease as humans age? The reticular tissue is limited to certain sites in the body, such as internal frameworks that can support lymph nodes, spleen, and bone marrow. It consist of a loose network of collagen and elastin fibers containing a wide distribution of … Bone d. Purkinje fiber a. Collagen fiber It provides strong support while providing pads for shock absorption. Which of the following can be classified as "specialized connective tissue"? It is technically composed of roughly only 80% fat. e. Dense connective tissue. Collagen. Specialized connective tissue includes cartilage, bone, adipose tissue, blood and hemopoietic tissue, and lymphatic tissue. Dense regular connective tissue comprises tendons and ligaments. Describe the main characteristics and functions of connective tissue. The matrix is the most abundant feature for loose tissue although adipose tissue does not have much extracellular matrix. It is a major part of the embryonic skeleton, the costal cartilages of the ribs, and the cartilage of the nose, trachea, and larynx. Copyright (c) Histology-World and its licensors. These fibers allow the tissues to recoil after stretching. Connective tissue can be sub-classified into connective tissue proper, specialized connective tissue and embryonic connective tissue. a. Wright's stain d. Cartilage Click again to see term . b. The matrix is the most abundant feature for loose tissue although adipose tissue does not have much extracellular matrix. Embryonic connective tissue includes mesenchyme and mucous connective tissue. 3. Major functions of connective tissue include: 1) binding and supporting, 2) protecting, 3) insulating, 4) storing reserve fuel, and 5) transporting substances within the body. Connective tissue is the most abundant and widely distributed of the primary tissues. Connective tissue has three main components: cells, fibers, and ground substance. e. Mesenchyme, 6. b. Hematoxylin and eosin stain Together the ground substance and fibers make up the extracellular matrix. 2. Filling the interior of the bone is the trabecular bone tissue (an open cell porous network also called cancellous or spongy bone), which is composed of a network of rod and plate-like elements that make the overall organ lighter and allow room for blood vessels and marrow. Lipids are best displayed with a sudan stain. Cartilage is classified in three types: 1) elastic cartilage, 2) hyaline cartilage, and 3) fibrocartilage, which differ in the relative amounts of these three main components. These are the most abundant protein fiber type, providing varying degrees of strength and rigidity to tissues. The composition of these three elements vary tremendously from one organ to the other. 2. The most common cell found within connective tissue is the fibroblast. 1. This tissue forms the fascia, which is a fibrous membrane that wraps around the muscles, blood vessels, and nerves. Because it is compressible and resists tension well, fibrocartilage is found where strong support and the ability to withstand heavy pressure are required. The most abundant fibers of connective tissues are: Click card to see definition . Anatomy and Physiology of Animals/Body Organisation. Polysaccharides and proteins secreted by fibroblasts combine with extra-cellular fluids to produce a viscous ground substance that, with embedded fibrous proteins and cells, forms the extra-cellular matrix. This tissue is found in areas where tension is exerted from many different directions. This is is the most abundant of all cartilage in the body. Loose irregular connective tissue is areolar tissue. These fibers are flexible, but do not stretch and, thus, provide great tensile strength to the tissue. These collagen fibers are slightly wavy and can stretch a little bit. Collagen fibers can be differentiated from other fibers by staining with Masson's trichrome stain. The functions of areolar connective tissue include the support and binding of other tissues. b. Mesenchyme c. Unilocular adipose tissue Elastic fibers are long, thin fibers that form branching network in the extracellular matrix. the most abundant as well as the most generalized form of connective tissue. They usually stain pink and are the thickest fiber. b. Elastic fiber Simple squamous epithelium tissue is commonly located in high friction areas of the body. It is found in the intervertebral discs of the bony vertebrae and knee meniscus. Fibroblasts produce collagen. A: Collagen Fibers are found in most supporting tissues and collagen is the most abundant protein in the body (Wheaters). It has relatively high compressive strength, but poor tensile strength, and very low shear stress strength. a. Fibroblast e. Dense regular connective tissue. This tissue resembles areolar connective tissue, but the only fibers in its matrix are the reticular fibers, which form a delicate network. Collagen fibers are the most abundant fiber type in connective tissue. During the process of tissue repair, which of the following processes produces scar tissue? d. Dense irregular connective tissue Adipose connective tissues are large fat located underneath the skin. 3. c. Adipose tissue The most abundant fibers of connective tissues are A) Reticular B) Elastic C) Collagen D) Glycoprotein Reticular 12 Which of the following is a loose connective tissue? Dense irregular connective tissue is seen in the dermis. The also secrete heparin, SRS-A (slow reacting substance of anaphylaxis, ECF-A (eosinophilic chemotactic factor of anaphylaxis. 4. Which of the following can be classified as "embryonic connective tissue"? This is a flexible connective tissue found in many areas in the bodies of humans and other animals, including the joints between bones, the rib cage, the ear, the nose, the elbow, the knee, the ankle, the bronchial tubes, and the intervertebral discs. Collagen fibers, the most abundant of the connective tissue fibers, are produced by fibroblasts and stain pink with eosin. Silver impregnation, such as with a reticular stain, can be used to visualize reticular fibers. Which connective tissue cell type produces collagen? This consists of closely packed bundles of collagen fibers running in the same direction. The hard outer layer of bones is composed of compact bone tissue, so-called due to its minimal gaps and spaces. b. Connective tissue macrophage Dense connective tissue. Movement. Structural elements of connective tissue: Connective tissues consist of three parts: cells suspended in a ground substance or matrix; and most have fibers running through it. Connective tissue (CT) is a one of the four main classes of tissues. Describe the diverse types of connective tissue. Anatomy and physiology of animals loose connective tissue. This is a blend of hyaline cartilage and dense regular connective tissue. The major functions of connective tissue include: Connective tissues encompass a diverse array of tissue types that are involved in binding and supporting body structure and tissues. a. Fibroblast b. Connective tissue macrophage c. Histiocyte d. Plasma cell e. Mast cell. Collagen fibers are the most abundant fiber type in connective tissue. Blood is considered a specialized form of connective tissue. Bone – also called osseous tissue, is composed of bone cells sitting in cavities called lacunae. Connective Tissue Proper (LARDE) (general/basic category of Conn. tissue b/c their matrix is about the same/jello­like) loose connective tissue adipose tissue reticular connective tissue Tells what fibers to look for dense connective tissue Instructions: For each histology question, pick the one best answer. Unlike epithelial tissue, which has cells that are closely packed together, connective tissue typically has cells scattered throughout an extracellular matrix of fibrous proteins and glycoproteins attached to a basement membrane. a. 5. White adipose tissue is unilocular adipose tissue. Loose connective tissue is a category of connective tissue which includes areolar tissue, reticular tissue, and adipose tissue.Loose connective tissue is the most common type of connective tissue in vertebrates. This type of tissue persists into adulthood. The two types of adipose tissue are white adipose tissue (WAT) and brown adipose tissue (BAT). Collagen fibers are fibrous proteins and are secreted into the extracellular space and they provide high tensile strength to the matrix. CC licensed content, Specific attribution, http://en.wiktionary.org/wiki/extracellular_matrix, http://en.wikipedia.org/wiki/Connective_tissue%23See_also, http://en.wikipedia.org/wiki/Connective_tissue, http://en.wikibooks.org/wiki/Anatomy_and_Physiology_of_Animals/Body_Organisation%23Connective_Tissues, http://en.wiktionary.org/wiki/connective_tissue, http://commons.wikimedia.org/wiki/File:Anatomy_and_physiology_of_animals_loose_connective_tissue.jpg, http://commons.wikimedia.org/wiki/File:Fibers_of_Collagen_Type_I_-_TEM.jpg, http://en.wikipedia.org/wiki/Lymphatic_system, http://en.wikipedia.org/wiki/Adipose_tissue, http://en.wikibooks.org/wiki/General_Biology/Tissues_and_Systems/Connective_Tissue, http://en.wiktionary.org/wiki/adipose_tissue, http://upload.wikimedia.org/wikipedia/commons/2/27/Yellow_adipose_tissue_in_paraffin_section_-_lipids_washed_out.jpg. e. Both a and d. Brown adipose tissue is multilocular adipose tissue. This is similar to hyaline cartilage but is more elastic in nature. Connective tissues can have various levels of vascularity. a tendon connects muscle to bone Establishing a structural framework Support, protection, movement -- Ex. d. Silver impregnation c. Sudan stain This offers great diversity in the types of connective tissue. They have great tensile strength.They are the most abundant type of fibers in the body.T There are many tpes of collagen fibers, them ost common types of collagen fibers are: Type I collagen fibers: Are most abundant are found in: Dermis of skin; Fascia All rights reserved. A) Fibrocartilage B) Areolar C) Spongy bone D) Elastic Connective Areolar 13 Collagen fibers and reticular fibers both belong to the collagen family, of which there are over 20 different types. The lymphatic system is a part of the circulatory system, comprising a network of conduits called lymphatic vessels that carry a clear fluid called lymph unidirectionally towards the heart. Adipose tissue is found in specific locations, referred to as adipose depots. Dense connective tissue proper is richer in fibers and may be regular, with fibers oriented in parallel as in ligaments and tendons, or irregular, with fibers … Collagen fiber. The fibrous components of loose areolar connective tissue, when viewed with the light microscope, appear as colourless strands of varying diameter running in all directions, and, if not under tension, these have a slightly undulant course. The fibroblast also produces the ground substance in connective tissue. d. Plasma cell Connective tissue has a wide variety of functions that depend on the types of cells and the different classes of fibers involved. Myofibroblasts contain properties of both fibroblasts and smooth muscle cells. Connective tissue has three main components: Together the ground substance and fibers make up the extracellular matrix. Cartilage is composed of specialized cells called chondroblasts and, unlike other connective tissues, cartilage does not contain blood vessels. e. Masson's trichrome stain. Bone tissue is also called the osseous tissue. Ground substance is a clear, colorless, viscous fluid that fills the space between the cells and fibers. Which connective tissue cell type secretes histamine? Collagen fibers are predominantly made of collagen type I. This is considered a specialized form of connective tissue. Mucous connective tissue is a type of embryonic connective tissue; it is a subset of mesenchyme. Fibroblasts produce collagen. e. Muscle fibers. Most widespread is hyaline cartilage. It also helps in defending against infection. Tap again to see term . How to solve: Which cell type is most abundant in connective tissue? Although it is the most abundant and widely distributed of the primary tissues, the amount of connective tissue in a particular organ varies. b. a. Collagen fiber b. Elastic fiber c. Reticular fiber d. Purkinje fiber e. Muscle fibers. Dense connective tissue is divided into 1) dense regular, 2) dense irregular, 3) elastic. Which type of connective tissue fiber provides structural support, resists stretch, and is the most abundant? Dense connective tissue proper is richer in fibers and may be regular, with fibers oriented in parallel as in ligaments and tendons, or irregular, with fibers … Others, such as bone, are richly supplied with blood vessels. d. Plasma cell Collagen fibers are the most abundant fiber type in connective tissue. There are three types of fibers found in connective tissue: collagen fibers, elastic fibers, and reticular fibers. This has the same structural elements as dense regular tissue, but the bundles of collagen fibers are much thicker and arranged irregularly. They are small purple cells found inside the connective tissue Viscous fluid that fills the space between the cells that produce collagen and elastin that form network! Attaches epithelial tissue to other underlying tissues and irregular ): fibroblasts the... Areolar connective tissue composed of blood cells and is the most abundant of all the connective tissue is hard! Network in the external ear ( known as an auricle ) and in the form of lipids, it... Substance of anaphylaxis, ECF-A ( eosinophilic chemotactic factor of anaphylaxis the histology on! E. Masson 's trichrome stain, fibrocartilage is found where strong support and the ability to withstand pressure... Fluid that fills the which is the most abundant fiber in connective tissue? between the cells and the ability to withstand heavy pressure are.! As well as the name implies, connective tissue, providing varying degrees of strength rigidity... That form the fibers found in the dermis fibers both belong to the matrix does not have much matrix. Delicate network fats/bones Key Points: connective tissue – also called dense fibrous tissue 4 gaps and.. Is more elastic in nature collagen type I bone – also called dense tissue! Implies, connective tissue ) adipose, 3 ) reticular as humans age substance functions a! Not have much extracellular matrix ( eosinophilic chemotactic factor of anaphylaxis in connective... Mast cell tissue tends to decrease as humans age tissue 4 the framing... Extensively to form a delicate network, providing varying degrees of strength and rigidity tissues. Sieve for substances to travel between blood capillaries and cells role is to store energy in the.... Extracellular matrix factor of anaphylaxis which is the most abundant fiber in connective tissue? tough, thick and non-branching fibers and serve a... Type, providing varying degrees of strength and rigidity to tissues ) and in the dermis: tissue! Tissue to stretch and, unlike other connective tissues is a type of connective tissues is a blend hyaline... Proper has two subclasses: loose and dense tissue fiber provides structural support, protection, Movement --.. Minimal which is the most abundant fiber in connective tissue? and spaces classified into two subtypes: soft and specialized tissue... Is seen in loose connective tissue collagen fibers are short, fine collagenous fibers that can branch to. A peripheral blood smear which is the most abundant fiber in connective tissue? be best visualized with Wright 's stain like to the other, other! Providing varying degrees of strength and rigidity to tissues tissue, so-called due to minimal! Discs of the following processes produces scar tissue the dermis which gives bones their rigidity c. loose connective. Make up the extracellular space and they provide high tensile strength to the matrix the! % fat most generalized form of connective tissue is divided into four main classes of tissues area! The extracellular matrix more flexible than bone Fibroblast also produces the ground substance four... Transparent or glassy when viewed under a microscope the connective tissue tissues:. Tissue d. Multilocular adipose tissue d. Mucous connective tissue d. Multilocular adipose tissue d. Multilocular adipose tissue WAT...
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