Most abundant are the fibres composed of the protein collagen. loose connective tissue a tendon bone hyaline cartilage Adipose tissue is distributed within two compartments of the human body: Parietal or subcutaneous fat, which is embedded in the connective tissue under the skin ; Visceral fat, which surrounds the internal organs, such as eyeballs (periorbital fat) or kidneys (perirenal fat capsule). It contains all three types of fibers (collagen, elastin, and reticular) with much ground substance and fibroblasts. Lymph contains a liquid matrix and white blood cells. It consists of narrow spindle-shaped cells with a single, centrally located nucleus. Skeletal muscle tissue is arranged in bundles surrounded by connective tissue. Loose (areolar connective tissue) is the most abundant form of collagenous connective tissue. Categories of connective tissue include the following: Loose connective tissue is found between many organs where it acts both to absorb shock and bind tissues together. Connective tissue - Connective tissue - Extracellular fibres: The fibrous components are of three kinds: collagenous, elastic, and reticular. The threemain types of cells that make up bone tissue include: 1. This is probably _____. Bone is the hardest connective tissue. The samples include different types of connective tissues and epithelial tissues using the microscope under magnification of 40x. Tug gently at your ear lobes, and notice that the lobes return to their initial shape. Bones and cartilage are the two types of connective tissue in this sub-category. Without mineral crystals, bones would flex and provide little support. The tumors generally consist of sheets of nearly identical cells with strands of connective tissue interspersed among them. The most common cell found within connective tissue is the fibroblast. It is made up of all the parts without specific functions of the organ - for example, connective tissue, blood vessels, ducts, etc. The different types of connective tissue are so diverse, there is no one set of characteristics that encompasses all the different types. Connective tissue is a term used to describe the tissue of mesodermal origin that that forms a matrix beneath the epithelial layer and is a connecting or supporting framework for most of the organs of the body. Examining Connective Tissue Under The Microscope. The matrix usually includes a large amount of extracellular material produced by the connective tissue cells that are embedded within it. Activity 2: Examining Connective Tissue Under the Microscope (p. 82) All connective tissues consist of cells located within a matrix. Figure 4.7. The cells are called chondrocytes (ch) and the spaces in the cartilage in which they are found are called lacunae. Under a light microscope, collagen fibers in the connective tissue framework of meat range in diameter from 1 to 12 micrometres (0.001 millimetre = 1 micrometre). Hyaline cartilage 400X Cartilage consists of cells embedded in a matrix (mat) of fibers and ground substance. Transport of fluid, nutrients, waste, and chemical messengers is ensured by specialized fluid connective tissues, such as blood and lymph. They are found throughout the body, but are most abundant in the reticular tissue of soft organs, such as liver and spleen, where they anchor and provide structural support to the parenchyma (the functional cells, blood vessels, and nerves of the organ). Platelets are cell fragments involved in blood clotting. Blood and lymph are the two types of connective tissue in this sub-category. The surface of hyaline cartilage is smooth. The distinctive appearance of cartilage is due to the presence of polysaccharides called chondroitin sulfates, which bind with ground substance proteins to form proteoglycans. Sources Hole's Essentials of Human Anatomy and Physiology. 7. Without collagen, bones would be brittle and shatter easily. Dense irregular elastic tissues give arterial walls the strength and the ability to regain original shape after stretching (Figure 4.9). It contains all the cell types and fibers previously described and is distributed in a random, web-like fashion. Under the microscope, the cartilage fibers appear as whispy lines arranged in an orderly fashion with chondrocytes spaced throughout. Adipose cells store surplus energy in the form of fat and contribute to the thermal insulation of the body. Types of cells that can be viewed under a basic compound microscope include cork cells plant cells and even human cells scraped from the inside of the cheek. Elastic cartilage looks very similar to hyaline cartilage under a microscope, and special stains must be used to show the otherwise invisible elastic fibers that give this particular cartilage type its name.Like hyaline, elastic cartilage also has single or multiple chondrocytes housed within spaces called lacunae. If you find a random arrangement of tissue under the microscope with spaces, it is most likely areolar tissue you are viewing. As a consequence, it displays greater resistance to stretching. 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. Areolar tissue is the most common loose connective tissue you have, found ALL over your body, 02:59 just under your epithelial tissue, and wrapped around your organs. Ground substance is an aqueous gel of glycoproteins and proteoglycans that occupies the space between cellular and fibrillar elements of the connective tissue. Take up the quiz below and prove it. Connective tissues include Areolar, Hyaline cartilage and Adipose as shown as Table 1.0. David Shier, Jackie Butler, Ricki Lewis. The dermis of the skin is an example of dense irregular connective tissue rich in collagen fibers. What kind of connective tissue is this? A common way of classifying the many different types of connective tissue is to subdivide it into three main sub-categories, and further divide those subcategories into specific types of connective tissue. Epithelium Return to Top. Some white blood cells have the ability to cross the endothelial layer that lines blood vessels and enter adjacent tissues. The lungs and arteries have a layer of elastic connective tissue that allows the stretch and recoil of these organs. It occurs in small, elongated … Liver histology. They are derived from osteoprogenitor cell… The surface of hyaline cartilage is smooth. As may be obvious from its name, one of the major functions of connective tissue is to connect tissues and organs. Pages 99-104. In other tissues, stretching in several directions is achieved by alternating layers where fibers run in the same orientation in each layer, and it is the layers themselves that are stacked at an angle. This ground substance is usually a fluid (water), but it can also be mineralized and solid, as in bones. Reticular tissue is a mesh-like, supportive framework for soft organs such as lymphatic tissue, the spleen, and the liver (Figure 4.8). You can see it here in green. Smooth muscle, muscle that shows no cross stripes under microscopic magnification. Organization of Cells. They do not often branch and, when branches are found, they usually diverge at an acute angle. The main property of elastin is that after being stretched or compressed, it will return to its original shape. Dense connective tissue is reinforced by bundles of fibers that provide tensile strength, elasticity, and protection. Today's Rank--0. Connective tissue is found throughout the body, usually in association with other tissues. It allows water, salts, and various nutrients to diffuse through to adjacent or imbedded cells and tissues. In dense irregular connective tissue, the direction of fibers is random. Epithelial Tissue: Epithelial tissue line the cavity and surfaces of organs and blood vessels throughout the animal body. Elastic fibers are prominent in elastic tissues found in skin and the elastic ligaments of the vertebral column. Osteocytes, bone cells, are located within lacunae. Connective tissue - blood. Under the light microscope, muscle cells appear striated with many nuclei squeezed along the membranes. It makes up a template of the embryonic skeleton before bone formation. It derives its name from the Latin reticulus, which means “little net.”. Embryologically it develops from the foregut and it spans the upper right and part of left abdominal quadrants. Identify and distinguish between the types of connective tissue: loose, dense, cartilage, bone, and blood, Explain the functions of connective tissues, Loose Connective Tissue – large amounts of ground substance and fewer fibers, Dense Connective Tissue – large amounts of fibers and less ground substance, Cartilage – specialized cells called chondrocytes are within the matrix (cartilage cells), Bone – strongest connective tissue with little ground substance, hard matrix of calcium and phosphorous and specialized bone cells called osteocytes, Blood – fluid connective tissue, no fibers – only ground substance (plasma) and cells (red, white, and platelets). Connective tissue proper includes loose connective tissue and dense connective tissue. Erythrocytes, red blood cells, transport oxygen and some carbon dioxide. The three main sub-categories of connective tissue are: These are the types of connective tissue that typically have all three of the defining characteristics listed above. Like other tissues inthe body, bones are made up of specialized cells that serve differentfunctions. Smooth muscle tissue, unlike striated muscle, contracts slowly and automatically. However, there are three characteristics that we consider diagnostic of most connective tissue types. Today 's Points. The matrix has two components, fibers and ground substance. Nutrients, salts, and wastes are dissolved in the liquid matrix called plasma and transported through the body. Its proteins It provides protection to internal organs and supports the body. All of these fiber types are embedded in ground substance. Histological for human physiology. Blood is no exception, but its cells float freely in a liquid matrix. Connective tissue is found throughout the body, usually in association with other tissues. 0. ; Like every other tissue, adipose tissue consists of cells and extracellular matrix. A. Each consists of specialized cells grouped together according to structure and function. http://cnx.org/contents/14fb4ad7-39a1-4eee-ab6e-3ef2482e3e22@7.1@7.1. Under the microscope, tissue samples appear clear. Author: Adrian Rad BSc (Hons) • Reviewer: Uruj Zehra MBBS, MPhil, PhD Last reviewed: October 29, 2020 Reading time: 14 minutes The liver is the largest internal organ of the human body, weighing approximately 1.5 kg. One of us! The proteoglycan attracts and traps available moisture forming the clear, viscous, colorless matrix you now know as ground substance. Body tissues conclusively make up body organs and various parts. Learn the terms, keywords, vocabulary, and much more about Microscopic Images of Tissues with our flashcards quizzes. The other part, the parenchyma, consists of the cells that perform the function of the tissue or organ. A layer of dense irregular connective tissue, the perichondrium, encapsulates the cartilage. Areolar Tissue. Leukocytes, white blood cells, are responsible for defending against potentially harmful microorganisms or molecules. Collagen is a raw material for major industries in leather, glue and cosmetics. These fibers hold connective tissues together, even during the movement of the body. Stroma (from Greek στρῶμα 'layer, bed, bed covering') is the part of a tissue or organ with a structural or connective role. A plate of hyaline cartilage at the ends of bone allows continued growth until adulthood. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. The fibroblast nuclei (stained purple) are … Basically, there are four types of tissues: nervous, muscle, epithelial, and connective. It fills the spaces between muscle fibers, surrounds blood and lymph vessels, and supports organs in the abdominal cavity. Attempt and answer these flashcards quizzes easily and have a smooth experience with it. Compact bone is solid and has greater structural strength. Figure 7: Fibrocartilage Elastic cartilage (Figure 8) is very springy and yellow, and is found in the epiglottis, the external ear, and the larynx. This tissue gives rigid support as well as elasticity. Image of blue, connective, loose - 130916821 The three main types of cartilage tissue are hyaline cartilage, fibrocartilage, and elastic cartilage (Figure 4.11). The rest of the tissues seen on this image are other types of connective tissue and smooth muscle. Study Microscopic Images of Tissues Flashcards Flashcards at ProProfs - This set of image-based flashcards gives medical students the Microscopic Images of Tissues. The matrix ground substance is the straw-colored fluid called plasma. The histology of transverse tissue from long bone shows a typical arrangement of osteocytes in concentric circles around a central canal (Figure 4.12). View the University of Michigan Webscope at http://virtualslides.med.umich.edu/Histology/Cardiovascular%20System/081-3_HISTO_40X.svs/view.apml to explore the tissue sample in greater detail. Cartilaginous tissue is avascular, thus all nutrients need to diffuse through the matrix to reach the chondrocytes. Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers and contains large amounts of proteoglycans. Bone is a highly vascularized tissue. It is lighter than compact bone and found in the interior of some bones and at the end of long bones. Under the microscope, tissue samples appear clear. Information. Blood is a fluid connective tissues. This type of tissue is used extensively throughout the body for fastening down the skin, membranes, blood vessels and nerves as well as binding muscles and other tissues together. Get started! Difference Between Epithelial and Connective Tissue Definition. Fat contributes mostly to lipid storage, can serve as insulation from cold temperatures and mechanical injuries, and can be found protecting internal organs such as the kidneys and eye. This slide shows a thin section of loose connective tissue (sometimes called areolar tissue). Enjoy the magnifications of the longitudinal section of Dense Connective Tissue Tendon. Skeletal muscle tissue is arranged in bundles surrounded by connective tissue. Areolar connective tissue is made of cells and extracellular matrix ("extra-" means "outside", so the extracellular matrix is material that is outside of the cells). Dense connective tissue contains more collagen fibers than does loose connective tissue. Osteoblasts- are the type of cells that form the matrix andcollagen fibers. Elastic cartilage contains elastic fibers as well as collagen and proteoglycans. (Note: Erythrocytes - red blood cells; have hemoglobin; don't have nuclei because they lose it when made from bone marrow. It constitutes much of the musculature of Areolar tissue underlies most epithelia and represents the connective tissue component of epithelial membranes, which are described further in a later section. Blood has two components:  cells and fluid matrix (Figure 4.13). The threadlike fibers labeled e … The external ear contains elastic cartilage. What is osteon, seen here? You need to get 100% to … areolar connective tissue, you have learned a cue that will allow you to recognize it. There are three major categories of dense connective tissue: regular, irregular, and elastic. osteocytes are bone cells central canals contain blood vessel every bone cell is near a nutrient supply bone is a very active tissue Bone most rigid connective tissue Bone’s rigid extracellular matrix contains mostly collagen fibers embedded in a mineralized ground substance containing hydroxyapatite, a form of calcium phosphate. Lymphatic capillaries are extremely permeable, allowing larger molecules and excess fluid from interstitial spaces to enter the lymphatic vessels. Epithelial Tissue: Epithelial cells are closely packed together. Connective Tissue: Connective tissue supports, connects and separates different types of tissues and organs in the body. Elastic connective tissue is a modified dense connective tissue that contains numerous elastic fibers in addition to collagen fibers, which allows the tissue to return to its original length after stretching Figure 4.10). Part 1: Under the Microscope Lab: Tissue Types 1. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Adipose tissue consists mostly of fat storage cells called adipocytes that store lipids as droplets that fill most of the cytoplasm (figure 4.6). The matrix plays a major role in the functioning of this tissue. In this photo of areolar connective tissue, nuclei of cells are stained but the cytoplasm is pale and not distinguishable. Photo about Areolar connective tissue under the microscope view. In this way, specialized lymphatic capillaries transport absorbed fats away from the intestine and deliver these molecules to the blood. Protection is another major function of connective tissue, in the form of fibrous capsules and bones that protect delicate organs and, of course, the skeletal system. As fibroblasts are the most common cells in areolar tissue, the majority of the nuclei seen here are probably fibroblast nuclei. Connective tissue has the most types of subcategories and the most varied functions of all the four major tissue types (epithelial, muscular, nervous, and connective tissues.) As its name indicates, it often serves to connect different tissues together, but it also can serve as a wrapper (in locations where a tough epithelial wrapping is not required), a structural support, cushioning, a storage repository, a protective layer, or a transport medium. This is a loose connective tissue widely spread throughout the body. Bonetissueis one of the main components of the skeletal system (other componentsinclude bone marrow/marrow cavity, collagen fibers etc). Learn vocabulary, terms, and more with flashcards, games, and other study tools. Game Points. Under the light microscope, muscle cells appear striated with many nuclei squeezed along the membranes. Microscope at 400X. Lymph drains into blood vessels, delivering molecules to the blood that could not otherwise directly enter the bloodstream. Dense regular connective tissue contains densely packed collagen fibers that run in the same direction. They both have all three of the defining characteristics listed above, but their extracellular matrix is tougher, denser, and more solid than the various types of connective tissue proper. Components of the areolar connective tissue A large number of capillaries allow rapid storage and mobilization of lipid molecules. Areolar tissue shows little specialization. Human Anatomy and Physiology Lab (BSB 141). Elastic fiber contains the protein elastin along with lesser amounts of other proteins and glycoproteins. Reticular fiber is also formed from the same protein subunits as collagen fibers; however, these fibers remain narrow and are arrayed in a branching network. Collagen fiber is made from fibrous protein subunits linked together to form a long and straight fiber. The amount and structure of each component correlates with the function of the tissue, from the rigid ground substance in bones supporting the body to the inclusion of specialized cells; for example, a phagocytic cell that engulfs pathogens and also rids tissue of cellular debris. Specialized cells in connective tissue defend the body from microorganisms that enter the body. Total Points. The knee and jaw joints and the the intervertebral discs are examples of fibrocartilage. Of extracellular material produced by the connective tissue is avascular, thus all nutrients need to through. 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