Stimuli, both internal and external, are detected and lead to a response (A-level only)

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Question 13

Medium

Describe how mechanical pressure on a Pacinian corpuscle produces a generator potential.

[3]

Scientists investigated the response of a Pacinian corpuscle to different levels of pressure applied to the skin. Their results are shown in Figure 1 below.

Figure 1: Change in membrane potential over time following stimulation

Use Figure 1 to explain how the results demonstrate the all-or-nothing principle.

[2]

During the period from 1.0 ms to 4.5 ms, even a very strong stimulus cannot generate a new action potential in this neurone. What is this period of time called?

[1]

Stimuli, both internal and external, are detected and lead to a response (A-level only)

Question 13

Stimuli, both internal and external, are detected and lead to a response (A-level only) Questions

Stimuli, both internal and external, are detected and lead to a response (A-level only)

Question 13

Stimuli, both internal and external, are detected and lead to a response (A-level only) Questions