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