unit 13 Flashcards
where is carbon dioxide excreted
carbon dioxide is excreted through the
lungs
what do the kidneys excrete?
the kidneys excrete urea and excess
water and ions
what is the the role of the glomerulus in the filtration
from the blood of water, glucose, urea and
ions?
high blood pressure in the glomerulus forces water, ions, urea and glucose out of the blood
what is the glomerulus?
a knot of blood vessels surrounded by the renal capsule
why are proteins and red blood cells not filtered?
Because they are too large
What is filtration also known as?
Ultrafiltration
what does the nephron reabsorb?
all of the glucose, some of the ion (using active transport)
what happens to the non-absorbed remaning urea water and ions?
They are passed on to the bladder as urine
what is the role of the liver?
assimilation of amino acids by converting them to proteins
how is urea formed?
urea is formed in the liver from excess
amino acids
what is deamination?
the removal of the nitrogen-containing part of amino acids to form
urea
why is excretion important?
urea is a toxic waste product so must be excreted before it reaches high concentrations
what is excretion?
The removal of toxic materials, the waste products of metabolism and substances in excess of requirements
