MCAT Biology Question 58: Answer and Explanation
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Question: 58
13. A neuron only fires an action potential if multiple presynaptic cells release neurotransmitter onto the dendrites of the neuron. This is an example of:
- A. saltatory conduction.
- B. summation.
- C. a feedback loop.
- D. inhibitory transmission.
Correct Answer: B
Explanation:
Some neurons require multiple instances of excitatory transmission to be brought to threshold. These excitatory signals may be close to each other in time (temporal) or in space (spatial); either way, this pattern of excitation is termed summation.