APs and Synaptic Transmission (Exam 1)

Question 1

Which ion will always cause a response?

Answer 1

sodium

Question 2

Ion concentration gradient is maintained by 2 processes. What are they?

Answer 2

passive diffusion (leaky channels) and active transport (sodium potassium pump)

Question 3

The ion conc. of a neuron at rest will have a high conc. of ____ and low conc. of ______ in the cytoplasm and the opposite in the interstitial fluid

Answer 3

K+, Na+

Question 4

Leaky channels are for which ions?

Answer 4

sodium and potassium

note: more potassium leaks out of the cell than sodium leaks into the cell, therefore the extracellular conc. of K+ has a stronger effect on the membrane’s potential

Question 5

T/F: the sodium potassium pump forces sodium and potassium against their conc. gradient

Answer 5

true

Question 6

Leaky channels are what type of diffusion?

Answer 6

passive facilitated diffusion

Question 7

Carrier proteins are specific to what?