PSL201Y1 Lecture Notes - Lecture 18: Renal Function, Autonomic Nervous System, Vascular Resistance
Document Summary
What do the kidneys do: maintain normal volume and composition of body fluids. By regulating ion composition (na+, k+, cl-, ca2: maintain blood pressure, hemoglobin levels, calcium levels. By regulating blood plasma volume: excrete waste products. By filtering blood plasma and add/remove solutes and water. *kidney also regulates ph and remove drug toxins. Resides within renal cortex, only the hairpin loop dips down into the renal medulla: juxtamedullary nephron (~15%) Most of its structure lies within the renal medulla. Composed of 2 distinct parts: renal corpuscle. Glomerulus -> clustered of capillaries: renal tubules. > not a 1:1 ratio of nephrons to collecting ducts. Renal artery -> segmental artery -> interlobar artery -> arcuate artery -> interlobular artery. > arcuate artery -> the branching will lead to afferent arteriole, which will go into renal corpuscle. > when it comes out of the renal corpuscle, the efferent arteriole creates capillary bed. > if it"s a corticol nephron (shorter nephron) peritubular capillaries.
