Lecture 28 – Histology – Vascular, Muscular, Nervous Tissue

Lecture 28 – Histology – Vascular, Muscular, Nervous Tissue

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Lecture 28 – Histology – Vascular, Muscular, Nervous Tissue A. Vascular tissue (fig. 43.4) – refers to the blood 1. Leukocytes (WBC) a. Granulocytes – there are large granules in the cytoplasm of the cell; in the medical field they are called polymorphonuclear (“many-shaped nucleus”) leukocytes 1) Neutrophils –of the white blood cell count, most common. These are phagocytic , and they digest bacteria (prokaryotic) in the cell. These are the MAJOR phagocytic cell in the blood (because they are the most numerous) 2) Eosinophils – less common than neutrophils; not phagocytic; their major function is to produce toxins against large (meaning eukaryotic) parasites, such as the helminths and fungi 3) Basophils – least common; similar to mast cells; they are found inside the blood; they produce histamines (vasodilators: increase diameter, increases permeability) and heparin (anticoagulant) b. Agranulocyte – without large granules in the cytoplasm of the cell; in the medical field they are called mononuclear leukocytes (the nucleus has one basic shape: either round or c-shaped) 1) Lymphocytes – fairly common; two major types: b lymphocytes and t lymphocytes a) B lymphocytes: responsible for humoral immunity (the production of antibodies; humoral refers to the blood) b) T lymphocytes – for cell-mediated immunity (they produce a chemical that controls
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This note was uploaded on 05/30/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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Lecture 28 – Histology – Vascular, Muscular, Nervous Tissue

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