434-441. Signalling in the Nervous System

Question 1

What is the typical resting membrane potential of neurons?

Answer 1

-60 mV to -70 mV

Question 2

Is the inside of a neuron at rest more positively charged or negatively charged?

Answer 2

Negatively charged

Question 3

What cells are responsible for myelination of CNS neurons?

Answer 3

Oligodendrocytes

Question 4

What cells are responsible for myelination of PNS axons?

Answer 4

Schwann cells

Question 5

Why do myelinated axons propagate action potentials quicker than unmyelinated axons?

Answer 5

The action potential in myelinated axons jumps from node to node

Question 6

List the investigations which can be used to localise cerebral function

Answer 6

PET - locates brain activity while performing a task

fMRI - locates brain activity while performing a task

EEG - investigate the cognitive processes in response to a stimulus

TMS - interrupts brain activity while performing a task