Excretory system Flashcards
(24 cards)
main function: remove metabolic ___ from transport medium and __ them to the outside
wastes, transport
nitrogenous wastes: together with ___ and other substances such as ___ combined to form ____ in mammals
water, salts, urine
carbon dioxide is an ____ waste formed during ____
excretory, respiration
excretion involves ___ wastes from body
expelling
why can’t nitrogenous wastes be stored the body?
they contain nitrogen, which is toxic if they accumulate
examples of nitrogenous wastes?
urea, uric acid ammonia
excretion is ___ linked with water balance in organisms
the ___ toxic the waste, the greater amount of ___ required to dilute it for excretion
closely, more, water
lowest to highest toxicity thus lowest to highest number of water..
nitrogenous wastes
uric acid, urea, ammonia
three distinct parts of kidney:
cortex (outside)
medulla (middle)
pelvis (inner)
what is the functional unit of the kidney called?
nephrons
what do nephrons do?
filter blood for metabolic waste, create urine and reabsorbs water for homeostasis
difference in chemical concentration of blood ___ and ___ an organ depends on the ___ of the organ
entering, exiting, function
lungs… blood in
contains lots of CO2
lungs… blood out
contains lots of O2
overall change in blood composition in lungs
decrease in CO2 and increase in O2
small intestines… blood in
less/ no traces of digestive end products
small intestines.. blood out
contains digestive end products
overall change in blood composition in small intestine
increase in digestive end products
all body cells… blood in
contains O2 and glucose
all body cells… blood out
contains CO2 and water
overall change in blood composition in all body cells
decrease in O2 and glucose, increase in CO2 and carbon dioxide
kidneys… blood in
contains urea, salt and water
kidneys… blood out
no urea, less salt and water
overall change in blood composition in kidneys
urea removed, less salt and water content
