BIOSC-139 Lecture Notes - Lecture 5: Basal Lamina, Microvillus, Nephron
9 Sep 2020
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Document Summary
Scattered along abutting sides of adjacent cells. Cytoplasmic side of each plasma membrane has a plaque. Intermediate filaments extend across the cytoplasm and anchor at desmosomes on opposite side of the cell. Are common in cardiac muscle and epithelial tissue. Located at the boundary between the epithelium and connective tissue. Noncellular supporting sheet between the epithelial tissue and the connective tissue deep to it. Consists of proteins secreted by epithelial cells. Acts as a selective filter, determining which molecules from capillaries enter the epithelium. Acts as scaffolding along which regenerating epithelial tissue cells can migrate. Basal lamina and reticular layers of the underlying connective tissue deep to it form the basement membrane. Have a core of actin filaments that stiffen the microvillus. Abundant in kidney tubules and small intestine. Maximize surface across which small molecules enter or leave cells. Cilia whiplike, highly motile extensions of apical surface membranes. Contain a core of microtubules held together by cross-linking and radial proteins.
