The kidneys

Cards (8)

What do kidneys do?
They filter the blood by taking waste products out, this is called filtration
What is absorbed back into the blood?
Glucose, ions and water - this is called selective reabsorption
What makes up urine?
Urea, ions and water
What is urea made of?
Proteins (and the amino acids that they are broken down into) and ammonia
Why are ions in urine as waste?
The body needs to keep the right balance of ions, so if the ion content of the body is wrong it needs to be balanced out
How is the concentration of urine controlled?
By the hormone ADH (anti-diuretic hormone)
When is ADH released?
The brain monitors the water content of the blood, ADH is released to adjust this
How is water content regulation controlled?
Negative feedback