HSS 3305 Chapter Notes - Chapter 2: Simple Squamous Epithelium, Nephron, Intermediate Filament
21 Jan 2019
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Document Summary
Nucleus contains dna (contains chromosomes), and rna (single, nucleolus: separated from cytoplasm by double-layer nuclear membrane; small pores allow communicatn. Endothelium and mesothelium: endothelium layer of simple squamous epithelium lining heart, blood vessels, and lymphatic vessels, mesothelium - layer of simple squamous epithelium lining pleural, pericardial, and peritoneal cavities. Movement of materials in and out of cells - oxygen and nutrients enter the cell and waste products are eliminated by crossing through a selectively permeable membrane. Diffusion and osmosis passive processes (no energy: osmosis: movement of water from dilute to concentrated solution, water diffuse freely across membrane, but solutes can"t, osmolarity measure of osmotic pressure from a solution. Ec concentration; ic na must be much lower than ec concentration. Adaptation of cells to changing conditions adaptation enables cells to function more efficiently, but can be detrimental to cell (i. e dysplasia) Normal conditions potassium actively transported into cell, sodium is moved out.
