Lecture 32 Unit 5 Flashcards
what makes up the urinary system
kidneys, ureters, urinary bladder, urethra
what do they kidneys do
filter the blood of wastes and return most of water and solutes to the bloodstream
what are the functions of the kidneys
- regulation of blood ionic composition
- regulation of blood pH and osmolarity
- regulation of blood glucose
- regulation of blood volume
- release of erythropoietin and calcitriol
- excretion of wastes and foreign substances
what are the 3 major functions of kidneys in the blood
flitration, reabsorption, and secretion
what do kidneys perform their actions on
blood plasma
where is 99% of nutrients in filtered blood plasma return to
blood through reasborption
if the concentration of any component of blood plasma exceeds its renal threshold where does the rest of that component go?
some returned to blood, rest lost in urine
can nephrons be replaced
no
when do nephrons become dysfunctional
until function declines to less than 25% normal
what happens when one kidney is removed
-remaining nephrons enlarge to handle additional work
what happens at the renal corpsuscle
filtration
what happens at the renal tubule
reabsorption
what does the renal tubule consist of
PCT, loop of Henle, DCT
where do efferent arterioles drain into
either vasa recta or peritubular capillaries
what do juxtamedullary nephrons allow by dipping into the medulla?
excretion of dilute or concentration urine
