A receptor potential:
a. Always leads to an action potential
b. Never leads to an action potential
c. Causes hyperpolarization of the neuron
d. Leads to an action potential if the stimulus is strong enough

검증된 단계별 안내

Understand the concept of a receptor potential: A receptor potential is a graded potential that occurs in sensory receptors in response to a stimulus. It is not an all-or-nothing event like an action potential, but rather its magnitude depends on the strength of the stimulus.

Recall the difference between graded potentials and action potentials: Graded potentials, such as receptor potentials, can vary in size and may or may not trigger an action potential. Action potentials, on the other hand, are all-or-nothing events that occur if the threshold is reached.

Analyze the conditions under which a receptor potential can lead to an action potential: If the receptor potential is strong enough to depolarize the membrane to the threshold level, it will trigger an action potential in the associated neuron.

Eliminate incorrect options: (a) is incorrect because a receptor potential does not always lead to an action potential. (b) is incorrect because a receptor potential can lead to an action potential under certain conditions. (c) is incorrect because receptor potentials can cause depolarization, not just hyperpolarization.

Select the correct answer: The correct option is (d) because a receptor potential leads to an action potential only if the stimulus is strong enough to depolarize the membrane to the threshold level.

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주요 개념

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Receptor Potential

A receptor potential is a graded change in the membrane potential of a sensory receptor cell in response to a stimulus. This change can vary in magnitude depending on the strength of the stimulus, and it is crucial for converting external stimuli into electrical signals that the nervous system can interpret.

Action Potential

An action potential is a rapid, all-or-nothing electrical signal that travels along the axon of a neuron. It occurs when the membrane potential reaches a certain threshold, typically triggered by a strong enough receptor potential. This process is essential for the transmission of information within the nervous system.

Threshold Stimulus

A threshold stimulus is the minimum level of stimulus intensity required to trigger an action potential in a neuron. If the receptor potential generated by a stimulus exceeds this threshold, an action potential will be initiated, leading to the propagation of the signal along the neuron.

A receptor potential:a. Always leads to an action potentialb. Never leads to an action potentialc. Causes hyperpolarization of the neurond. Leads to an action potential if the stimulus is strong enough