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Summary - Medical BioSciences (MBS214) - Activity
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Activity for Lecture 41. With regards to action potentials:
A. The smaller stimuli trigger it
B. Sodium ions leave the cells
C. The voltage-gate sodium ions channel opens once the threshold potential is reached.
D. The membrane is hyperpolarized before it repolarized
E. During the repolarization stage, potassium enter the cell
2. Which of the following does NOT consider multipolar Neurons?
A. Have very long axon
B. Multiple dendrites, one axon
C. Common in the CNS
D. Cell body situated in the center
E. Include all skeletal muscle motor neurons
3. Which statement is true regarding the resting potential?
A. The resting potential exists because the plasma membrane is highly permeable to
chloride ions.
B. A typical neuron has a resting potential of approximately -70 mV.
C. The sodium-potassium exchange pump ejects 2 Na+ ions for every 3 K+ ion it brings
into the cell.
D. The electrochemical gradient for potassium ions is very large.
E. Sodium ions leave the cells
4. Electrical impulses gather and accumulate in which part of a neuron in order to
initiate an action potential?
A. Dendrites
B. Axon hillock
C. Axon terminal branches
D. Node of Ranvier
E. Dendritic branches
5. Which of the following nerve fibres are typically all unmyelinated?
A. Aα fibres
B. Aδ fibres
C. B fibres
D. C fibres
E. Both C and Aδ fibres
6. The opening of axon membrane voltage-gated potassium channels is responsible for
which part of the action potential?
A. Depolarisation of the membrane
B. Repolarisation of the membrane
C. Contraction of the postsynaptic muscle fibre
D. Signalling vesicular release of neurotransmitters
E. All answers are correct
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