Anti-Diuretic Hormone

Question 1

What is the concentration of urine controlled by?

Answer 1

A hormone called anti-diuretic hormone (ADH)

Question 2

Where is ADH released into your blood?

Answer 2

ADH is released into your blood via the pituitary gland

Question 3

What is negative feedback and an example of it.

Answer 3

Controlling water balance is an example of negative feedback, where one system is the reverse to another in order to maintain a steady state.

Question 4

What happens when blood water level becomes too high?

Answer 4

• Receptors in your hypothalamus detect a decrease in salt concentration. No stimulus is sent to the pituitary gland.
• Less ADH is secreted into the blood
• Your kidneys become less permeable, so less water is reabsorbed
• Your bladder fills with a large quantity of dilute urine.

Question 5

What happens when blood water level becomes too low?

Answer 5

• Receptors in your hypothalamus detect an increase in salt concentration. A stimulus is sent to the pituitary gland. Thirst is stimulated to encourage drinking.
• More ADH is secreted into the blood
• Your kidneys become more permeable, so more water is reabsorbed.
• Your bladder fills with a small quantity of concentrated urine