HUBS192 Lecture Notes - Lecture 36: Peritubular Capillaries, Afferent Arterioles, Efferent Arteriole
17 Jan 2020
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Some substances can enter directly from peritubular capillaries into the renal tubules (known as secretion); good for getting rid of waste products that aren"t needed. Reabsorption is specific for different molecules; returned to peritubular capillaries. Potassium (all gets filtered, can be reabsorbed/secreted at different parts of tubule; different locations on the tubule for k+ regulation) Water: filtered/reabsorbed, under hormonal control in some parts of tubule penicillin/drugs/toxic products; can be secreted into tubules and excreted. Big proteins (not filtered); rbc as well; unless kidney problems! Separate things using a sieve; ultrafiltration ; blood rushes past the barrier; some things pass through. Creates a plasma-like (watery component of blood) filtrate in the nephron tubules. Big things e. g. rbc are too big to get through; just the watery part of the blood that can move through filtration barrier and end up in renal tubules. Over time as blood passes through; you regulate blood substances.
