5.2.2 Osmoregulation Flashcards
1
Q
Define osmoregulation.
A
- The control of blood water potential.
2
Q
What is the role of osmoreceptors?
A
- Monitor blood water potential.
3
Q
What causes the blood water potential to change?
A
- Dehydration
- Too much water.
4
Q
What would occur if the blood water potential is too low? (3)
A
- Water leaves the osmoreceptors and moves into the blood by osmosis.
- Osmoreceptors shrink.
- Action potentials generated.
- Lower water potential therefore higher frequency impulses to the posterior pituitary gland.
5
Q
What would occur if the blood water potential is too high? (3)
A
- Water enters the osmoreceptors by osmosis. Too much can make the cell burst, so they send lower frequency impulses to the posterior pituitary gland.
6
Q
Where does the posterior pituitary gland receive impulses from?
A
- Osmoreceptors in the hypothalamus.
7
Q
How does ADH effect the collecting duct membrane?
A
- To become more permeable to water by increasing the number of aquaporins in the membrane resulting in more water being reabsorbed.
