106 Science Quiz Revision

Science Learning Modules
Introduction to the Nervous System

1. The period after an initial stimulus when a neuron is NOT sensitive to another stimulus is the ____________.
a) resting period
b) repolarisation
c) depolarisation
d) absolute refractory period

2. The part of a neuron that conducts impulses away from its cell body is called a(n) _______________.
a) axon
b) dendrite
c) neurolemma
d) Schwann cell

3. Which ion channel opens in response to a change in membrane potential and participates in the generation and conduction of action potentials?
a) mechanically gated channel
b) voltage-gated channel
c) leakage channel
d) ligand-gated channel

4. An impulse from one nerve cell is communicated to another nerve cell via the __________.
a) cell body
b) synapse
c) receptor
d) effector
e)

5. The substance released at axon terminals to propagate a nervous impulse is called a(n) ___________.
a) ion
b) cholinesterase
c) neurotransmitter
d) biogenic amine

6. What area of a nerve cell carries impulses towards the nerve cell body?
a) dendrite
b) neurolemma
c) axon
d) nucleus

7. Which one (1) of the following is NOT a function of myelin?
a) protection of dendrites
b) protection of axons
c) insulation of nerve fibres
d) speed up nerve impulses

8. Which one (1) of the following is the correct description of a nerve cell conducting an electrical impulse?
a) sodium channels in the plasma membrane of the nerve cell are closed
b) sodium ions move out of the cell
c) the outside of the nerve cell becomes more positively charged
d) the outside of the nerve cell becomes negatively charged

The Nervous System

1. The brain stem consists of which one (1) of the following:
a) cerebrum, pons, midbrain, and medulla
b) midbrain, medulla, and pons
c) pons, medulla, cerebellum, and midbrain
d) midbrain only

2. The subarachnoid space lies between what two layers of meninges?
a)