get rid of urea - made in the liver during deanmination (excess amino acids converted to fats for waste and stage)
regulates ion and water
why is water regulation important
stops water cells from swelling up (lysist) if there's too much
not enough the shrink (crenation)
nephrons
as blood passes through the glomerulus into the bowman's capsule kidneys tubules absorb small stuff (filtration)
substances we then want are further selectively reabsorbed from the blood stream
water content
too little water the receptors tell the hypothalamus to single the pituitary gland to produce adh into the blood lower the permablitliy of the collecting duct and tells the kidney to reabsorb more water into the blood and less urine is produced
too much hypothalamus doesn't signal to pituary gland and produce less adh so less water is reabsorbed by the tubles and more urine is produced
what happens to the useful substances that aren't reabsorbed
continues from the nephron into collecting duct and passes into the ureter and then the bladder.And is released through the urethra
