excretion Flashcards
what does urine contain?
water, urea and ions
what is ADH?
a hormone
where is ADH made?
in the brain
how does ADH travel?
it travels to the kidneys through the blood
what is volume of urine produced controlled by?
the collecting duct
what is the permeability of the walls of the collecting duct controlled by?
ADH
where is blood filtered under pressure?
bowman’s capsule
what are forced out of capillaries into the nephron?
liquid and small molecules
what are reabsorbed back into the blood?
glucose and amino acids
why is glucose reabsorbed back into the blood?
it is needed for respiration
why are amino acids reabsorbed back into the blood?
they are needed for growth and repair
where does the reabsorption take place?
the proximal convoluted tubule
what is a glomerulus?
a tangle of blood vessels in the bowman’s capsule
what is the liquid forced out of the blood?
glomerular filtrate
how is glomerular filtrate forced out?
ultrafiltration
what is in glomerular filtrate?
water, glucose, amino acids, urea, hormones and ions
what is in urine at the end?
water, ions, urea
what do the kidneys control?
water balance
what do the kidneys remove from the blood?
waste urea
what is excretion?
removal of waste products made inside cells of the body
how is urea made?
from the breakdown of amino acids that the body can’t use
where is urea made?
in the liver
what is the word equations for urea?
amino acids - urea + carbohydrate