SS3. ADH and Aldosterone

Question 1

What is the difference between ADH and Aldosterone?

Answer 1

Aldosterone: H2O permeable, pulls in Na, K pushed into urine. Na+ cannot cross membrane, increasing tonicity –> H2O flows into blood
ADH: H2O impermeable. Uses H2O channels to get water into the blood cells.

Question 2

What happens with osmolarity when Aldosterone incvreases osmoles?

Answer 2

It works on increasing osmoles, thereby increasing volume. Because they’re both effected, the osmolarity is not affected.

Question 3

What happens with osmolarity when ADH causes an increase in volume in blood vessels?

Answer 3

Osmoles don’t go up, so osmolarity decreases.

Question 4

What do you do when you want to increase volume, but maintain osmolarity?

Answer 4

Increase aldosterone, ADH isn’t used.

Question 5

What do you do when you want to increase volume regardless of osmolarity?

Answer 5

Both aldosterone and ADH should be increased

Question 6

What do you do if you want to decrease osmolarity regardless of volume?

Answer 6

Use ADH to decrease osmolarity. Don’t use aldosterone

Question 7

What do you do if you want a decrease in osmolarity, but maintain the volume?

Answer 7

Decrease aldosterone (decreases osmoles and volume, unaffecting osmolarity)
Increase ADH (increases volume that's been decreased by aldosterone, and lowers osmolarity).