excretion in humans (topic 13) Flashcards
excretion
the removal of toxic materials and substances in excess of requirements from organisms.
name 3 excretory products
carbon dioxide, urine, sweat
describe excretion of carbon dioxide
co2 is one of the products of aerobic respiration, excreted via lungs after being transported there by its dissolved self in blood plasma
what is the urinary system
Organ system involved in excretion of urea, and excess salts and water. It includes the kidneys, ureters and urethra.
ureter
carries urine to the bladder
urethra
carries urine to the outside
bladder
temporarily stores urine
what does the kidney do
excrete urea, excess water and ions as urine
passageway of urine in body
kidney- ureter- bladder- urethra
function of liver
assisting the body in taking up amino acids for cellular use
breaking down excess amino acids (deamination)- to produce urea
deamination
The removal of the nitrogen-containing part of amino acids to form urea.
what is the role of the liver in assimilation
converts amino acids into proteins
where is urea formed
in liver, by excess amino acids
renal artery vs renal vein
renal artery- carries blood to the kidney
renal vein- carries blood away from kidney
what are the structures in the kidney
cortex, medula, ureter