AQA Biology 2023 · Paper 3 · Question 1

2023 · Paper 3 · Question 1 · 6 marks

1.1

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

Scientists investigated the stimulation of a Pacinian corpuscle in the skin of a fingertip. The scientists applied two different pressures to the fingertip and recorded the changes in membrane potential of the Pacinian corpuscle's sensory neurone.

Figure 1 shows the scientists' results.

Figure 1 is in the question paper

3 marks

1.2

Use Figure 1 to describe what is meant by the all-or-nothing principle.

Figure 1 is in the question paper Figure for 1.2

2 marks

1.3

On Figure 1, from 0.6 ms to 4.0 ms, no new generator potential could be produced.

What is this time period called?

Figure 1 is in the question paper Figure for 1.3

1 mark

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