Excretory System Flashcards
Urea
synthesized in liver
converted from excess nitrogen
Renal vein
returns purified blood from the kidneys to the circulatory system (through inferior vena cava)
Internal Sphincter in bladder
smooth muscle
involuntary control
External Sphincter in bladder
skeletal muscle
voluntary
Glomerular Filtration Rate increases with
directly dependent on pressure
constriction of efferent arteriole
dilation of afferent arteriole
(high pressure in glomerulus)
Afferent arteriole
brings blood into the glomerulus in kidney
Efferent arteriole
takes blood away from the glomerulus
Proximal Convoluted Tubule (PCT)
glucose, AA actively transported out of filtrate
99% of organic volume gets reabsorbed
secretion of wastes - urea, creatine, uric acid (RNA breakdown)
most absorption
in renal cortex
Distal Convoluted Tubule (DCT)
specialized reabsorption/secretion affected by aldosterone secretes HCO3-, H+ most secretion in renal cortex
Descending limb of Loop of Henle
permeable to H2O not ions
passive transport
thin walled
in renal medulla
Ascending limb of Loop of Henle
permeable to ions not H2O
active transport
thin walled - not permeable to H2O; passively transports ions out of filtrate
thick walled - actively transports ions out of filtrate
in renal medulla
Medulla will suck out Water out of the _____ _____ by ____
collecting duct by osmosis
Vasa Recta
like loop of Henle
helps to maintain high concentration of salt in medulla
return water reabsorbed from filtrate to the bloodstream
Ascending limbs of Vasa Recta
near the descending limb of loop of Henle
carry H2O that gets reabsorbed in the descending limb
Descending limbs of Vasa Recta
near the ascending
