PHYL 1010X Lecture 3: All Physiology Lab Notes
16 Jan 2016
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Allows nutrients and some ions to enter. Driven by concentration or pressure differences gradients. Simple: no membrane protein assistance, diffusion of solute particles in water. Facilitated: requires membrane bound carrier protein for. Kinetic energy drives this until solution reaches equilibrium. Osmosis water moves with its concentration gradient, higher to lower water concentration. Filtration capillary wall movement, according to pressure gradient driving force, depends on pore size, non selective. Fluids and solutes filter out of capillaries in kidneys to kidney tubules because blood pressure in capillaries is greater than pressure in tubules. Amount of filtrate dependent on pressure gradient + membrane pores. Blood cells + proteins are too big. Vesicular transport: phagocytosis, endocytosis, pinocytosis, exocytosis. Molecular weight cutoff (mwco) larger the mwco, larger pores, larger molecular mass. Osmotic pressure: force needed to be applied to oppose osmosis in a closed system (mmhg) concentration of nondiffusing solutes. Tonicity: the way a solution affects the volume of a cell.
