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| Description: Capillary Exchange Substances cross capillary walls by: Diffusion Transcytosis Bulk flow Diffusion Substances such as oxygen, carbon dioxide, glucose, amino acids, and some hormones cross capillary walls via simple diffusion Transcytosis Large, lipid-insoluble molecules (like insulin) cross capillary walls in vesicles via transcytosis Bulk flow is a passive process in which large numbers of ions, molecules, or particles in a fluid move together in the same direction Bulk flow occurs from an area of higher pressure to an area of lower pressure, and it continues as long as a pressure difference exists Bulk flow is more important for regulation of the relative volumes of blood and interstitial fluid Filtration is pressure-driven movement of fluid and solutes from blood capillaries into interstitial fluid Blood hydrostatic pressure (BHP) and interstitial fluid osmotic pressure (IFOP) promote filtration Reabsorption is pressure-driven movement of fluid and solutes from interstitial fluid into blood capillaries Interstitial fluid hydrostatic pressure (IFHP) and blood colloid osmotic pressure (BCOP) promote reabsorption Picture Stats: Views: 564 Filesize: 947.22kB Height: 915 Width: 1242 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=40265 |