Multiple Choice
The all-or-none law of action potentials states which of the following?
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45. Nervous System
Neurons and Action Potentials
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Which of the following correctly matches a part of a typical multipolar neuron with its primary function?
A
Axon hillock – releases neurotransmitters into the synaptic cleft
B
Axon terminal – generates action potentials
C
Dendrite – receives incoming signals from other neurons
D
Cell body (soma) – transmits action potentials to target cells
Verified step by step guidance1
Step 1: Understand the structure of a multipolar neuron. A multipolar neuron typically consists of dendrites, a cell body (soma), an axon, an axon hillock, and axon terminals. Each part has a specific function in the transmission of neural signals.
Step 2: Review the function of dendrites. Dendrites are branched extensions of the neuron that receive incoming signals (usually in the form of neurotransmitters) from other neurons and transmit these signals toward the cell body.
Step 3: Examine the role of the cell body (soma). The soma contains the nucleus and organelles and is responsible for integrating incoming signals from the dendrites. It does not transmit action potentials to target cells; that is the role of the axon.
Step 4: Clarify the function of the axon hillock. The axon hillock is the region where the cell body transitions into the axon. It is the site where action potentials are initiated, not where neurotransmitters are released.
Step 5: Understand the role of the axon terminal. The axon terminal is the endpoint of the axon where neurotransmitters are released into the synaptic cleft to communicate with target cells. It does not generate action potentials; that occurs at the axon hillock.
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