Name:
Score: /25
1. A membrane usually has a resting membrane potential of about
A. 0 mV
B. 40 mV
C. -70 mV
D. -100 mV
2. Increasing the stimuli beyond the critical threshold level will i the intensity of the nerve impulse and ii the speed of the neurons firing.
i / iiA. / increase / increase
B. / increase / reduce
C. / reduce / have no effect on
D. / have no effect on / have no effect on
3. The jumping of action potential from one node of Ranvier to the next is know as
A. ionic conduction
B. hypo-stimulation
C. hyper-stimulation
D. saltatory conduction
4. The term given that describes the voltage potential across a nerve cell membrane when it is not transmitting a nerve impulse is
A. resting potential.
B. action potential.
C. depolarization.
D. repolarization.
5. When a cell is said to be in resting potential it has a i concentration of sodium ions ii the cell.
i / iiA. / greater / outside
B. / greater / inside
C. / changing / outside
D. / changing / inside
6. A membrane of an excited nerve will have a potential of about
A. 0 mV
B. 40 mV
C. -70 mV
D. -100 mV
7. Sodium and potassium ions can cross the phospholipid membrane by the process of
A. osmosis
B. diffusion
C. endocytosis
D. faciltated diffusion
8. The nerve impulse is also called the
A. hyperpolarized membrane
B. polarized membrane
C. resting potential
D. action potential
9. When a cell is said to be in resting potential it has a i concentration of potassium ions ii the cell.
i / iiA. / greater / outside
B. / greater / inside
C. / changing / outside
D. / changing / inside
10. A charged resting membrane is called a
A. polarized membrane.
B. repolarized membrane.
C. depolarized membrane.
D. hyperpolarized membrane.
11. During a nerve impulse the cell membrane becomes more permeable to i which causes the charge on both sides of the membrane to ii .
i / iiA. / potassium / stay the same
B. / sodium / stay the same
C. / potassium / reverse
D. / sodium / reverse
12. The term given that describes the voltage potential across a nerve cell membrane when it is transmitting a nerve impulse is
A. resting potential.
B. action potential.
C. repolarization.
D. polarization.
Use the following diagram to answer the following 6 questions
13. The line labelled “1” represents the
A. activation energy
B. action potential
C. threshold level
D. polarization
14. The influx of sodium ions into the cell is represented by the area labelled
A. 1
B. 2
C. 3
D. 4
15. Repolarization occurs in the area labelled
A. 1
B. 2
C. 3
D. 4
16. Depolarization occurs in the area labelled
A. 1
B. 2
C. 3
D. 4
17. Hyperpolarization occurs in the area labelled
A. 1
B. 2
C. 3
D. 4
18. The outflux of potassium ions from the cell occurs in the area labelled
A. 1
B. 2
C. 3
D. 4
19. The time taken for the membrane to return to the resting position after is described as the
A. action potential.
B. resting potential.
C. refractory period.
D. depolarization period.
20. The reason why an impulse only moves in one direction is that the membrane directly behind it is
A. polarized.
B. depolarized.
C. repolarized.
D. hyperpolarized.
21. Hyperpolarization is caused by the
A. fast shutting of the sodium gates.
B. slow shutting of the sodium gates.
C. fast shutting of the potassium gates.
D. slow shutting of the potassium gates.
22. Sodium and potassium ions can cross the phospholipid membrane against the concentration gradient with
A. passive transport using a gated sodium or potassium channel
B. passive transport using a sodium-potassium pump
C. active transport using a gated sodium or potassium channel
D. active transport using a sodium-potassium pump
Use the diagram below to answer the next two questions
23. The dendrites in the above diagram are labelled
A. 1
B. 2
C. 3
D. 4
24. The axon in the above diagram is labelled
A. 1
B. 2
C. 3
D. 4
25. The cell body in the above diagram is labelled
A. 1
B. 2
C. 3
D. 4