Zusammenfassung der Ressource
The Human Kidney
- Main Organ
- Maintains homeostasis
(Keeping body conditions as
normal as possible
- Produce Urea to breakdown
excess amino acids.
- Excess amino acids come from the protein in food we eat
- And worn out body tissue
- Urea is poisonous
- Vital for the water balance in the body
- Concentration changes then water
moves in or out of the system by
Osmosis.
- Could damage or destroy cells
- Lose water constantly through the lungs as water
evaporates into the air when you breath.
- You lose water when you sweat
- Remove any excess water leaving it as urine
- Kidneys conserve water
- Ion concentration is important
- Take on mineral ions with food
- Processed food is high in salt which
means lots of minerals
- Some are lost through sweat
- Kidneys filter your blood then re-absorb what the body needs
- Glucose, Amino Acids, Mineral Salts and Urea move out of the
blood into kidney tubules by diffusion
- Blood cells are left behind
- All sugar then Re- absorbed into the blood by
active transport
- Some urea gets back into the blood by diffusion on a concentration gradient
- Rich Blood supply
- Urine
- Contains waste urea with excess mineral ions
and water not needed
- Quantities depend on how much you have
taken in and given out
- On a hot day if you drink very little you urine will be
very concentrated being a dark yellow colour
- On a cold day if you drink a lot your
urine will be dilute and colourless.