U6T7 – Nerves: Receptors (Pacinian Corpuscles and Eye)

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Nerves: Receptors (Pacinian Corpuscles and Eye)

1 / 15

When a stimulus is detected by a receptor, it generates a potential difference across it's plasma membrane. What is the name of this potential difference?

2 / 15

Can the potential difference created by a receptor have different values depending on the size of the stimulus?

3 / 15

What is the stimulus detected by a Pacinian corpuscle? (type your answer)

4 / 15

Name part A on the above diagram.

5 / 15

Name part B on the above diagram (type your answer).

6 / 15

What type of sodium channels are opened when a Pacinian corpuscle is stimulated?

7 / 15

When the layers of connective tissue are pressed, what happens to the neurone membrane?

8 / 15

In order for an action potential to be generated in a Pacinian corpuscle, what must happen?

9 / 15

The diagram above shows a cross section of a human eye. Name layer A (Type your answer).

10 / 15

Layer B is the layer which contains the photoreceptor cells. What is it's name ? ( Type your answer).

11 / 15

Point C is the point where most colour sensitive photoreceptor cells are located. What is it called?

12 / 15

What is the structural adaptation which give cones high visual acuity compared to rod cells?

13 / 15

What is the structural adaptation which gives rods high sensitivity compared to rod cells?

14 / 15

The cone density is highest on the fovea in the centre of the retina. In a human fovea there are 150 000 cones per mm2. The diameter of a human fovea is 1.2 mm. Calculate the number of cones on the human fovea.

15 / 15

When light falls on cells 1 and 2, only one spot of light is seen. But, when light falls on cells 2 and 3, two spots of light are seen. Say why?

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