An action potential is
a. a reversal of the Na+ and K+ concentrations inside and outsidethe neuron.
b. the same size and shape at the beginning and the end of theaxon.
c. initiated by inhibitory post synaptic graded potentials.
d. transmitted to the distal end of a neuron and cause release ofneurotransmitter.
e. Both b and d are correct

2. Axonal transport refers to:
a. the release of neurotransmitter molecules into the synapticcleft.
b. the use of microtubules to send secretions from the cell body tothe axon terminal.
c. the transport of vesicles containing proteins down the length ofthe axon.
d. the movement of the axon terminal to synapse with a newpostsynaptic cell.
e. Both b and c are correct

3. Which of the following neuron(s) is known to be a motorneuron?
a. Pseudounipolar.
b. Bipolar.
c. Anaxonic.
d. Muiltipolar.
e. Both a and b are correct/ Beide a en b is korrek.

4. 4. Which one of the following glial cells is responsible for theblood brain barrier?
a. Oligodendrocytes.
b. Astrocytes.
c. Microglia.
d. Ependymal cells.
e. Satellite cells.

5. Which one of the following glial cells is responsible formyelination in the central nervous system?
a. Oligodendrocytes.
b. Astrocytes.
c. Microglia.
d. Ependymal cells.
e. Satellite cells.

6. Calculate the equilibrium membrane potential for Na+ for anextracellular fluid concentration of 138 mM and an
intracellular fluid concentration of 16 mM.
a. -90 mV.
b. -84 mV.
c. -72 mV.
d. –63 mV.
e. +57 mV.

7. Which of the following will open mechanically gated ionchannels?
a. Acetylcholine release
b. Pressure
c. Change in membrane potential
d. Pain
e. Temperature

8. Which ion channel(s) is / are open during the repolarisationphase of the action potential recorded in a neuron.
a. Na+
b. K+
c. Cl-
d. Ca++
e. Both a and b will open

9. Rank the following neurons for their speed of conduction fromfastest to slowest:
a. Myelinated 20 µm diameter axon
b. Unmeylinated 20 µm diameter axon
c. Unmeylinated 200 µm diameter axon
a. a, b, c
b. a, c, b
c. c, b, a
d. b, c, a
e. c, a, b

10. If you place an electrode in the middle of an axon andartificially depolarise the cell above threshold, in which
direction will an action potential travel?

a. To the axon terminal
b. To the cell body
c. Both a and b are correct
d. In neither direction