KINESIOL 1AA3 Lecture Notes - Lecture 5: Hypothalamus, Adventitia, Myelin

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Carry blood: to the heart and back. Exchange of materials: nutrients, waste products and gases. Regulate blood pressure: by changing the resistance, vasodilation or vasoconstriction. Directs blood flow to tissues: e. g. Lined with endothelial cells: surrounded by a basement membrane, substances move through by diffusion. Lipid-soluble/ water-soluble molecules: moves through the plasma membrane. Large water-soluble molecules: moves through fenestrae, gapes between endothelial cells. Has no gaps between endothelial cells: less permeable to large molecules, e. g. Areas where the cytoplasm is absent: the plasma membrane is made of a thin diaphragm, highly permeable. There are areas without a diaphragm: makes it even more permeable, e. g. Large in diameter and has large fenestrae: less basement membrane, e. g. A larger diameter sinusoidal capillary: has sparse basement membranes, e. g. Even larger than sinusoids: but similar in structure, e. g. The first entry point into the capillary network: a branch of the arteriole. The most direct route to the capillary network.

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