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Describe how stimulation of a Pacinian corpuscle produces a generator potential. - AQA - A-Level Biology - Question 1 - 2023 - Paper 3

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Describe how stimulation of a Pacinian corpuscle produces a generator potential.

Worked Solution & Example Answer:Describe how stimulation of a Pacinian corpuscle produces a generator potential. - AQA - A-Level Biology - Question 1 - 2023 - Paper 3

Step 1

Stretch-mediated sodium ion channels

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Answer

When a Pacinian corpuscle is stimulated by pressure, it activates stretch-mediated sodium ion channels located in its membrane. This deformation occurs due to the mechanical pressure applied.

Step 2

Deformation of membrane

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Answer

The increased pressure causes changes to the sensory neurone's membrane or the surrounding lamellae, leading to alterations in the channel structure.

Step 3

Depolarization and generator potential

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Answer

As a result, sodium ions diffuse into the cell, causing depolarization of the membrane. This depolarization leads to the generation of a generator potential within the sensory neurone.

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