Module 3

Question 1

At threshold…

Answer 1

K+ current = inward Na+ current

Question 2

What is Absolute Refractory period

Answer 2

Na gates open and second depolarisation impossible

Question 3

What is Relative Refractory period

Answer 3

Na gates closed but K gates open

Question 4

what is myelin sheath

Answer 4

white lipid protein that protects/insulates peripheral nerves

Question 5

What are the 3 options of termination

Answer 5

degadration:by enzymes. by post
reuptake by pre synaptic
diffusion away from the site

Question 6

Explain excitatory post synaptic potential

Answer 6

NT binding leads to membrane depolorization.
membrane opens ONE channel for K and Na

Question 7

Inhibitory Post synaptic potential

Answer 7

NT binding leads to membran hyperpolirization by increasing cl or K+ permeability.

Question 8

most effective synapses are…

Answer 8

Close to axon hillock

Question 9

Whats the difference between primary and secondary active transport

Answer 9

In primary active transport, the transport protein gets phosphorylated; in secondary active transport, the transport protein is not phosphorylated.

Question 10

Which of the following types of glial cells produce the myelin sheaths that insulate the neural fibers in the CNS?

Answer 10

Oligdencytes

Question 11

Difference between tract and nerve

Answer 11

tract: bundle of nerve processes in CNS
Nerve: bundle of nerve processes in PSN