Diffusion - Passage of a substance from a high to a low concentration, Osmosis - Passage of water from a weaker to a stronger solution across a semi-permeable membrane, Reabsorption - Passage of a substance from the renal tubules into the renal capillaries and so back into the circulation, Excretion - Removal of nitrogenous waste products and excess water from the body, Osmoregulation - Keeping the chemical composition and volume of the blood constant by eliminating excess water and salts,

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