Osmoregulation and Excretory Systems
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9 Terms
What is the problem to be solved?
maintaining appropriate ion balance
maintaining appropriate h2o volume
getting rid of waste
ion concentration functions
K+/Na+: nerve contraction
Ca2+: muscle contraction
H+→pH: function of protein depends on pH
Order of urine excretion
ammonia → urea → uric acid → out of body
Ammonia
excess acids from amino acid breakdown not used to build new proteins; becomes urea
What can the body break down for energy?
glucose → lipids → proteins → DNA
Reabsorption
tubules to blood
Secretion
blood to tubules
How have vertebrates in salty environments adapted?
have salt gland in addition to kidney to excrete excess salt
How have vertebrates in dry environments adapted?
kidneys conserve water, secrete condensed urine, and produce dry feces
