Author Question: What determines whether a neuron has an action potential? a. only the number of EPSPs impinging ... (Read 52 times)

V@ndy87 · **on:** Jun 22, 2018

What determines whether a neuron has an action potential?

a. only the number of EPSPs impinging on an axon
b. only the number of IPSPs impinging on the dendrites
c. the combined effects of EPSPs and IPSPs
d. summation effects of IPSPs

Question 2

Describe the different causes and mechanisms of osmotic thirst.

What will be an ideal response?

ktidd · **Reply #1 on:** Jun 22, 2018

Answer to Question 1

c

Answer to Question 2

Osmotic thirst is caused by an increased concentration of solutes in the extracellular fluid, either by increased salt intake, or water loss. Osmotic thirst is detected by neurons in the OVLT that cause increased release of vasopressin (which decreases urine output and raises blood pressure) and increased activity in the LPO to initiate drinking, preferably of pure water.