EXCRETION Flashcards
filtration
the excretory tubules collects as filtrate from the blood.
-taken into tubules as filtrate
reabsorption
the transport epithelium reclaims needed substances from the filtrate where they return to the body as fluids.
-reclaiming of substances in filtrate
secretion
other unwanted compounds are actively extracted from the body fluids and added to the filtrate for excretion
-other toxins in body put into filtrate
excretion
the filtrate leaves the body as urine
renal arteries
branch off the aorta and supply blood to the kidneys
renal veins
carry blood away from kidneys to inferior vena cava
nephron
the functional unit of the kidney
juxtamedullary nephron
dives deep into the medulla
enables mammals to produce urine that is hyper osmotic to the body fluids.
proximal tubule
salts water and nutrients are absorbed
descending limb
water reabsorption
water permeable but not very permeable to solutes
ascending limb
permeable to solutes, but not much to water.
osmolarity of the filtrate increases
distal tubule
regulates NaCl and K+ in body fluids.
varies absorption and secretion
collecting duct
plays role in how much NaCl is reclaimed in the filtrate
diuresis
removal of excess water in urine
diuretics
drugs that cause more excretion in urine
