kidney Flashcards
what is excretion
the removal of toxic materials and waste products of metabolism
what are the organs of excretion?
- skin
- lungs
- kidney
what does skin excrete?
sweat
what does the water in sweat do?
helps keep the body cool in hot conditions, and it contains salts and urea
what do lungs excrete?
excess carbon dioxide and some water vapour
what do the kidneys excrete?
excess water, salt and urea
why is homeostasis essential?
it keeps the conditions in our body constant
what bodily conditions need to be kept constant?
- water
- salts
- glucose
- CO2 levels in blood
- pH of blood
- body temp
what % of the body does water make up?
60-70%
what is nitrogenous waste?
waste that contains nitrogen
why is glucose reabsorbed?
used in respiration to release ATP
why is water reabsorbed?
maintain concentration in blood
what is osmoregulation?
control of water levels in the body
what is the role of the aorta in the urinary system?
blood supply to the kidneys
straight from the aorta - high pressure
what is the role of the kidneys in the urinary system?
homeostatic organ - controls water and salt concentration
excretory organ - concentrates nitrogenous waste to be removed
what is the role of the ureter in the urinary system?
tube in which urine passes out of the kidneys
what is the role of the vena cava in the urinary system?
removes the blood once filtered by the kidney
what is the role of the bladder in the urinary system?
stores urine before release