_______ receptors are normally inactive, but become active for a short time whenever there is a change in the modality that they monitor.

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Understand the question is asking about a type of receptor that is usually inactive but activates briefly when there is a change in the stimulus it monitors.

Recall that sensory receptors can be classified based on how they respond to stimuli: some respond continuously, while others respond only to changes.

Identify that receptors which respond only to changes in stimulus intensity or modality are called 'phasic receptors' or 'adaptation receptors'.

Phasic receptors quickly adapt to a constant stimulus and become inactive, but they fire impulses when the stimulus changes, signaling new information.

Therefore, the answer involves recognizing that these receptors are called 'phasic receptors' because they are normally inactive but activate briefly upon changes in the monitored modality.

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Receptor Modality

Receptor modality refers to the specific type of stimulus a sensory receptor is sensitive to, such as light, sound, or pressure. Each receptor is specialized to detect changes in its particular modality, enabling the nervous system to interpret different environmental signals accurately.

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Sensory Receptor Classification by Modality

Phasic Receptors

Phasic receptors are sensory receptors that remain inactive when a stimulus is constant but become active briefly when there is a change in the stimulus. They are important for detecting changes or new events in the environment, such as the onset or removal of a stimulus.

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Adaptation of Sensory Receptors Example 1

Sensory Adaptation

Sensory adaptation is the process by which sensory receptors reduce their response to a constant stimulus over time. This allows the nervous system to focus on new or changing stimuli, preventing overload from unchanging background information.

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Adaptation of Sensory Receptors Example 1

Pratica correlata

Domanda del libro di testo

Identify and shade in the locations of all the ascending sensory tracts in the following diagram of the spinal cord.

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Domanda del libro di testo

The larger the receptive field, the

(a) Larger the stimulus needed to stimulate a sensory receptor

(b) Fewer sensory receptors there are