Collagen fibers are relatively wide and stain a light pink, while elastic fibers are thin and stain dark blue to black. All connective tissue consists of three main components: fibers (elastic and collagenous fibers), ground substance and cells. Which of the following is NOT a step in tissue repair? This tissue type can have very different structures according to the proportions of its components. The thin lines in the image are the cell membranes, and the nuclei are the small, black dots at the edges of the cells. (E) Mucoid Connective Tissue: In addition to above mentioned connective tissues, mucoid tissue occurs as a foetal or embryonic connective tissue. Bone, or osseous tissue, is a connective tissue that has a large amount of two different types of matrix material. The fibers can be arranged irregularly or regularly with the strands lined up in parallel. Connective tissue connects structures in the body to provide support for organs, store fat, and transport substances. Cartilage. Damaged hyaline cartilage is replaced by fibrocartilage and results in the joints becoming “stiff.”. (a) Compact bone is a dense matrix on the outer surface of bone. Connective tissues are made up of a matrix consisting of living cells and a non-living substance, called the ground substance. the ground substance & fibers make up the extracellular matrix. No matter what the tissue, one characteristic common to all connective tissue is that it is composed mostly of an intercellular material called “ matrix .” matrix matrix matrix matrix matrix 10. 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. In the tissues, the collagen fibrils are believed to be held together by a polysaccharide component. Which of the following is NOT found in cartilage but is found in bone? Collagen fibers provides high tensile strength. The cells, called chondrocytes, make the matrix and fibers of the tissue. areolar tissue soaks up excess fluid in an inflamed area. Hyaline cartilage consists of a matrix with cells called chondrocytes embedded in it. Between the lamellae are cavities called lacunae. Connective tissue is the most abundant tissue in the body, consisting of cells and extracellular matrix. What should you do first with the sample? Over time, these plates can break causing the bone to become less resilient. For example, the average diameter of a primate red blood cell is 7.5 µl, a dog is close at 7.0 µl, but a cat’s RBC diameter is 5.9 µl. Blood is considered a connective tissue because it has a matrix, as shown in Figure 6. BONES Bones are a fourth example of connective tissue. Neutrophils are phagocytic cells and they participate in one of the early lines of defense against microbial invaders, aiding in the removal of bacteria that has entered the body. Osteocytes are found in lacunae of the bone. In biology, matrix is the material in between a eukaryotic organism's cells. Erythrocytes are consistently the same size in a species, but vary in size between species. Figure 6. This cell makes the fibers found in nearly all of the connective tissues. Loose connective tissue is composed of loosely woven collagen and elastic fibers. Stratified epithelia are present where protection from abrasion is important. III. Unlike other types of tissues, connective tissues are classified more by the stuff in which the cells lie — the extracellular matrix — than by the cells themselves. Connective tissues are made of different combinations of ground substance and fibers. Another leukocyte that is found in the peripheral blood is the monocyte. Adipose tissue helps to store energy in the form of fat, cushion internal organs, and insulate the body. Connective tissue extracellular matrix is composed of ________. All forms of connective tissue are composed of (1) extracellular fibres, (2) an amorphous matrix called ground substance, and (3) stationary and migrating cells. Select the correct statement regarding epithelia. Connective tissue is a type of animal tissue made up of cells, fibers, and gel-like substances that supports and gives structure to the body. Macrophages, lymphocytes, and, occasionally, leukocytes can be found in some of the tissues. Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the animal and points of attachment for tendons. Generally speaking, connective tissues are largely non-living extracellular matrix. The ground substance is made of an organic substance (usually a protein) and an inorganic substance (usually a mineral or water). Adipose tissue, or fat tissue, is considered a connective tissue even though it does not have fibroblasts or a real matrix and only has a few fibers. Adipose tissue is composed of cells called adipocytes that collect and store fat in the form of triglycerides for energy metabolism. Glands, such as the thyroid, that secrete their products directly into the blood rather than through ducts are classified as ________. Cartilage is a connective tissue with a large amount of the matrix and variable amounts of … What is connective Tissue? When a connective tissue has a high concentration of cells or fibers, it has proportionally a less dense matrix. Together the fibers and ground substance make up the extracellular matrix. Connective tissue, therefore, is made up of cells and extracellular matrix. Connective tissue is composed of cells and an extracellular matrix that binds the cells and organs, integrating all parts of the body. The principal cell of connective tissues is the fibroblast. Select the correct statement regarding the stem cells of connective tissue: "Blast" cells are undifferentiated, actively dividing cells. Chondrocytes are found in spaces within the tissue called lacunae. Fibrocartilage comprises the intervertebral discs in vertebrate animals. Which tissue type would likely function to hold the kidneys in place? The matrix in connective tissues gives the tissue its density. Connective tissue consists of three main components: cells, protein fibers, and an amorphous ground substance. The wavy lines seen between the lacunae are microchannels called canaliculi; they connect the lacunae to aid diffusion between the cells. Figure 1. Cartilage is a connective tissue with a large amount of the matrix and variable amounts of fibers. Figure 5. It is variations in the composition of the extracellular matrix that determine properties of the connective tissue. Mast cells synthesize and release substances of physiological importance (e.g., heparin and histamine). The connective tissue of an organ is usually referred to as the stroma. Leukocytes are counted in the thousands in the blood with measurements expressed as ranges: primate counts range from 4,800 to 10,800 cells per µl, dogs from 5,600 to 19,200 cells per µl, cats from 8,000 to 25,000 cells per µl, cattle from 4,000 to 12,000 cells per µl, and pigs from 11,000 to 22,000 cells per µl. Elastic fibers are composed of elastin molecules and can be found together with collagen fibers in tissues that require elasticity in addition to tensile strength, e.g., the lung. They examine tissue specimens through a microscope to identify cancers and other diseases. Depending on the type of connective tissue, the fibers are either collagen fibers, reticular fibers, elastin fibers, or a combination of two or more types. The tissue is also found around and between most body organs. Which of the following statements is true of connective tissue? Figure 4. The fiber type that gives connective tissue great tensile strength is ________. This tissue is very elastic and has considerable strength. Some tissues have specialized cells that are not found in the others. Under a microscope, adipose tissue cells appear empty due to the extraction of fat during the processing of the material for viewing, as seen in Figure 5. What are the three main components of connective tissue? Endothelium provides a slick surface lining all hollow cardiovascular organs. Bones are made up of different types of connective tissue, including bone tissue and marrow. Connective tissues connect, support, and bind body structures together. Mesenchymal cells are most commonly found in ________ connective tissue. They provide for mechanical support, movement, tissue fluid transport, cell migration, wound healing, and—as is becoming increasingly evident—control of metabolic processes in other tissues.1,2 Unlike the properties of epithelial, muscle, or nerve tissues, which depend primarily on their cellular elements, the properties of CT are determined primarily by the … This fiber consists of thin strands of collagen that form a network of fibers to support the tissue and other organs to which it is connected. Merocrine glands are not altered by the secretory process. Osteoclasts are usually found on the surface of the tissue. Two additional leukocytes in the blood are eosinophils and basophils—both help to facilitate the inflammatory response. The matrix plays a major role in the functioning of this tissue. Monocytes give rise to phagocytic macrophages that clean up dead and damaged cells in the body, whether they are foreign or from the host animal. It is found in various connective tissues. Lymphocytes function primarily in the immune response to foreign antigens or material. Collagen fibers provide strength to the tissue, preventing it from being torn or separated from the surrounding tissues. Elastic fibers provide flexibility to the tissues. http://cnx.org/contents/185cbf87-c72e-48f5-b51e-f14f21b5eabd@10.8, fibroblasts, macrophages, some lymphocytes, some neutrophils, irregular: skin regular: tendons, ligaments, hyaline: few collagen fibrocartilage: large amount of collagen, shark skeleton, fetal bones, human ears, intervertebral discs. Choose which tissue would line the uterine (fallopian) tubes and function as a "conveyer belt" to help move a fertilized egg towards the uterus. The fibers and other components of the connective tissue matrix are secreted by fibroblasts. They account for the majority of proteins in the ECM, which makes them the most abundant proteins in the human body. The matrix can be a variety of substances. Osteoclasts bore tunnels into the bone and osteocytes are found in the lacunae. Albumin 4. Unlike cells of epithelial tissue, connective tissue cells are not directly attached to one another. The loose or areolar connective tissue is made up of many cell types and intercellular materials (matrix), which also comprise other connective tissues but in varying proportions. Compact bone is found in the shaft (or diaphysis) of a long bone and the surface of the flat bones, while spongy bone is found in the end (or epiphysis) of a long bone. This gives strength and flexibility to the tissue. It is generally used as a jelly-like structure instead of cytoplasm in connective tissue. Compact bone is organized into subunits called osteons, as illustrated in Figure 4. It contains high quantities of water, several types of cells, and a fibrous extracellular matrix. In the central nervous system, the three outer membranes (the meninges) that envelop the brain and spinal cord are composed of connective tissue. A remnant of this cartilage persists in the outer portion of the human nose. Which of the following epithelia forms the walls of the air sacs across which gas exchange occurs in the lungs? A pathologist may oversee clinical laboratories for the evaluation of body tissue and blood samples for the detection of disease or infection. Long bone 20. The type and arrangement of the fibers gives each type of connective tissue its particular properties. The matrix usually includes a large amount of extracellular material produced by the connective tissue cells that are embedded within it. Which of the following is a modification of the simple columnar epithelium that allows for efficient absorption along portions of the digestive tract? Spongy bone is made of tiny plates called trabeculae these plates serve as struts to give the spongy bone strength. Arteries, veins, and lymphatics keep clots from sticking as long as their ________ is intact and healthy. In most cases, the cells that produce that matrix are scattered within it. Blood vessels, nerves, and lymphatic vessels are found in the central Haversian canal. Skin, lung, and blood vessel walls have which tissue characteristic in common? Connective tissue is composed of living cells and protein fibers suspended in a gel-like material called matrix. Inability to absorb digested nutrients and secrete mucus might indicate a disorder in which epithelial tissue? The inorganic matrix consists of mineral salts—mostly calcium salts—that give the tissue hardness. Adipocytes contain lipid droplets of stored triglycerides. Connective tissue that provides support and framework for the body consists of fibrous proteins and nonfibrous ground substance in varying proportions depending on their functions.. 2. Adipose is a connective tissue is made up of cells called adipocytes. Elastic fibers are made of the protein elastin; this fiber can stretch to one and one half of its length and return to its original size and shape. A many-layered epithelium with cuboidal basal cells and flat cells at its surface would be classified as ________. Select the correct statement regarding adipose tissue: Its primary function is nutrient storage. The principal job of an erythrocyte is to carry and deliver oxygen to the tissues. Erythrocytes (red blood cells), the predominant cell type, are involved in the transport of oxygen and carbon dioxide. Finger nails and toenails grow from matrices. Adipose tissue, or fat tissue, is considered a connective tissue even though it does not have fibroblasts or a real matrix, and has only a few fibers. Connective tissue is made up of a material called a matrix, with cells embedded within. Also present are various leukocytes (white blood cells) involved in immune response. The slightly granular material among the cells is a cytoplasmic fragment of a cell in the bone marrow. The organic portion or protein fibers found in connective tissues are either collagen, elastic, or reticular fibers. Regular fibrous connective tissue, shown in Figure 2, is found in tendons (which connect muscles to bones) and ligaments (which connect bones to bones). What tissue has Lacunae, calcium salts, and blood vessels. Pigmented connective tissue is present in the choroid, ciliary body and iris of the eye and dermis of the human skin. As illustrated in Figure 1, loose connective tissue has some fibroblasts; macrophages are present as well. A pathologist is a medical doctor or veterinarian who has specialized in the laboratory detection of disease in animals, including humans. Mammalian erythrocytes lose their nuclei and mitochondria when they are released from the bone marrow where they are made. 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