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Chapter 13: Problem 24

Transmission of the nerve signal across a synapse is accomplished by the a. movement of \(\mathrm{Na}^{+}\) and \(\mathrm{K}^{+}\). b. release of a neurotransmitter by a dendrite. c. release of a neurotransmitter by an axon. d. release of a neurotransmitter by a cell body. e. All of these are correct.

Short Answer

Expert verified
The correct answer for the transmission of nerve signal across a synapse is accomplished by the release of a neurotransmitter by an axon (option C).

Step by step solution

01

Option A: Movement of Na+ and K+ ions

The movement of Na+ and K+ ions play a role in the propagation of nerve signals within a neuron, but they are not directly involved in the transmission across the synapse between different neurons. So, this option is not correct.
02

Option B: Release of a neurotransmitter by a dendrite

Dendrites receive signals from other neurons, but they are not involved in the release of neurotransmitters. The release of neurotransmitters occurs at the axon terminal, not the dendrite. So, this option is also incorrect.
03

Option C: Release of a neurotransmitter by an axon

When a nerve signal reaches the axon terminal, the release of neurotransmitters is triggered. These neurotransmitters then cross the synapse and bind to dendrites on the adjacent neuron, continuing the transmission. This is the correct process of nerve signal transmission across a synapse So, option C is correct.
04

Option D: Release of a neurotransmitter by a cell body

The cell body typically contains the nucleus and other organelles, and its primary role is to maintain the neuron's health. It is not directly involved in the release of neurotransmitters. Thus, this option is incorrect.
05

Option E: All of these are correct

Since we have identified that only option C is correct, this option must be incorrect.
06

Conclusion

The correct answer for the transmission of nerve signal across a synapse is accomplished by the release of a neurotransmitter by an axon (option C).

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Most popular questions from this chapter

Repolarization of an axon during an action potential is produced by a. inward diffusion of Na' b. outward diffusion of \(\mathrm{K}^{+}\) c. inward active transport of \(\mathrm{Na}^{+}\) d. active extrusion of \(\mathrm{K}^{+}\)

The hypothalamus does not a. control skeletal muscles. b. regulate thirst. c. control the pituitary gland. d. regulate body temperature.

The autonomic system has two divisions, called the a. CNS and PNS. b. somatic and skeletal divisions. c. efferent and afferent divisions. d. sympathetic and parasympathetic divisions.

What types of nerves make up the PNS? How many of each type are there, and what areas of the body do each serve? \((\text { pages } 290-91)\)

Explain transmission of a nerve signal across a synapse. (page \(281)\)
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