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Connective Tissues
ASSIGNMENT III
1. DISCUSS THE HISTOLOGIC CHARACTERISTICS AND FUNCTION OF THE
FOLLOWING CELLS OF THE CONNECTIVE TISSUE:
● FIBROBLASTS
● ADIPOCYTES
● MACROPHAGES
● MAST CELLS
● PLASMA CELLS
● LEUKOCYTES
Ans : CONNECTIVE TISSUE HISTOLOGICAL CHARACTERISTICS
FUNCTION
FIBROBLASTS Fibroblasts are spindle-shaped, which means they are elongated, large, and flat in appearance. And their nucleus is flat and oval. It is helping for the healing of wounds, these cells produce fibers. ADIPOCYTES Fat droplets are present inside the cytoplasmic layer. Storage is the main function. It will store fatty acids and glucose for producing chemical energy. MACROPHAGES Oval-shaped nucleus and mitochondria are present in the cytoplasm. Mitochondria is rod-shaped. It will help for the detection of microorganisms and ward off other harmful organisms and bacteria. It will release cytokine at the time of inflammation. MAST CELLS Cell outline of the cell is sometimes oval and Same as macrophages it will help for immunity
Connective Tissues
irregularly arranged. It has one nucleus at the center. from foreign organisms and help for inflammatory processes. PLASMA CELLS Hetero chromatin is present inside the nucleus in a clock face arrangement and the structure of the nucleus is eccentric. Factory of the cell for the production of immunoglobulin and its secretion. LEUKOCYTES Irregularly arranged cell and white. It will battle against infections and other disfunction
2. DISCUSS THE DIFFERENT FIBER TYPES COMPRISING THE CONNECTIVE TISSUE: ● COLLAGEN ● RETICULAR ● ELASTIC Ans : COLLAGEN FIBER: The major function of collagen fiber is to give strength to the tissues. Mainly to the skin and provide elasticity. These are insoluble in nature. Mainly present in the dermal region; skin, cartilage, bone, etc. Under the microscope, the fibers will appear in a dark and white band in-between. Parallel fibrils of collagen molecules have 50-90 nm in diameter. RETICULAR FIBER: Reticular fibers are present in the specialized loose connective tissue and form a supporting stroma for some tissues and organs. These are extracellular fibers with a diameter of 100-150 nm. They do not possess the collagen bundle appearance, they appear like fibers with branching. At the time of wound healing, the fibroblast cells will produce reticular fibers. These fibers are later replaced by collagen fiber specifically type I collagen fiber. ELASTIC FIBER: Cannot use conventional methods for analyzing elastin fibers and elastic fibers require separate stains. The arteries and arterioles have a concentric sheet of elastic fibers, by the production or release of smooth
Connective Tissues
b. DENSE IRREGULAR CONNECTIVE TISSUE: Here the fibroblasts and collagen fibers are arranged in a disordered manner. The skin consists of these kinds of connective tissue.
- SPECIALIZED CONNECTIVE TISSUE: This type of tissue includes cartilage, bones, and blood. a. CARTILAGE: Intercellular matrix of cartilage is resistant to compression and is pliable and solid in structure. Chondrichthyes are secreted in the matrix cavities. Most of the cartilages in the embryonic state are replaced as bone-in adults except the joint of the ear, the tip of the nose, and adult limbs, etc. b. BONES: The ground substance of bone is hard and non pliable because of the presence of calcium salts and collagen fibers. The main function of bone is it will protect other organs and tissues from mechanical destruction. Osteocytes or bone cells are produced inside lacunae. In the bone, the bone marrow produces blood cells. c. BLOOD: Is the only one fluid connective tissue. Blood contains RBC, WBC, and platelets. Blood is a circulating fluid to help the transport of various substances.
