Poorly answred ESQ Flashcards
(3 cards)
1
Q
Why does the concentration of the fluid in the PCT remain constant?
A
Water is also reabsorbed
2
Q
When a person is dehydrated the cell volume of an osmoreceptor decreases. Explain why.
A
- Water potential of the blood will decrease.
- Water moves out of osmoreceptors into the blood
3
Q
The retinal of an owl has a high density of rods cells.
Explain how this enables an owl to hunt its prey at night.
3M
A
- High visual sensitivity
- Several rod cells connected to a single neurone
- Enough neurotransmitter to reach the threshold of excitation
