Homeostasis is the maintenance
of a constant internal environment. It is achieved using negative feedback.
Showing posts with label Human excretion. Show all posts
Showing posts with label Human excretion. Show all posts
14 March 2014
# 100 Dialysis and its application in kidney machines
The usual treatment for a person with kidney failure is to have several sessions a week using a dialysis unit (a kidney machine), to maintain the glucose and protein concentration in blood diffusion of urea from blood to dialysis fluid.
# 99 Urea formation, breakdown of alcohol & drugs in liver
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| Photo credit: James X - Biology Blog |
Surplus amino acids in the
bloodstream cannot be stored. They are removed by the liver and broken down
into the urea (which is the nitrogen-containing part of the amino acid) and a
sugar residue, which can be respired to release energy. The breakdown of amino
acids is called deamination.
# 98 Function of the kidney - filtration and reabsorption
The function of the kidney
is to filter blood, removing urea and excess
H2O, reabsorbing glucose, some H2O and some mineral
salts.
#97 Structure of the kidney, the nephron
Excretion is the
removal from organisms of toxic materials, the waste products
of metabolism and substances in
excess of requirements (carbon dioxide,
urea, salts…).
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