Multiple Choice
How is depolarization in a hair cell different from depolarization in a typical neuron?
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45. Nervous System
Neurons and Action Potentials
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Which of the following best describes the connection between the function of neurons and the chemical adenosine?
A
Adenosine acts as an inhibitory neuromodulator that decreases neuronal activity and promotes sleep.
B
Adenosine directly stimulates the generation of action potentials in neurons.
C
Adenosine is the primary neurotransmitter responsible for muscle contraction.
D
Adenosine increases the release of excitatory neurotransmitters at synapses.
Verified step by step guidance1
Understand the role of adenosine in the nervous system. Adenosine is a neuromodulator, meaning it influences the activity of neurons rather than directly transmitting signals like neurotransmitters.
Recall that adenosine generally acts as an inhibitory agent in the brain. It reduces neuronal activity and is associated with promoting sleep and relaxation.
Eliminate incorrect options based on the known function of adenosine. For example, adenosine does not directly stimulate action potentials, nor is it responsible for muscle contraction, as these are functions of other molecules like acetylcholine.
Consider the mechanism of adenosine's inhibitory effect. It decreases the release of excitatory neurotransmitters at synapses, which reduces overall neuronal activity.
Select the option that aligns with the inhibitory role of adenosine and its connection to promoting sleep, which is: 'Adenosine acts as an inhibitory neuromodulator that decreases neuronal activity and promotes sleep.'
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