More on the Kidneys

Question 1

What is the response if you are dehydrated?

Answer 1

• The hypothalamus senses that there is not enough water in the blood.
• The pituitary gland secretes more ADH.
• The ADH causes the kidneys to reabsorb more water.
• Increases the permeability of the walls in the collecting duct (a small volume of concentrated urine is produced).

Question 2

What is the response if you drink too much water?

Answer 2

• The hypothalamus senses that there is too much water in the blood.
• The pituitary gland secretes less ADH.
• This makes the kidneys reabsorb less water.
• The permeability of the walls in the collecting duct is low (a large volume of dilute urine is produced).

Question 3

What is kidney dialysis?

Answer 3

• A machine that filters the blood for the person.
  ✓ No suppressed immune system.
  ✘ Bad lifestyle, tied to a machine, not a long term solution.

Question 4

What is organ donation?

Answer 4

• Replacing a faulty organ with another working one.
  ✓ Does not require hospital treatment and helps lifestyle.
  ✘ Anti rejection, lack of organs.