Topic 6A- Stimuli and Responses

Question 1

What is the role of a receptor?

Answer 1

detects changes in the internal and external environment

Question 2

What is a photoreceptor?

Answer 2

detects changes in light

Question 3

Give an example of a mechanoreceptor

Answer 3

the Pacinian Corpuscle

Question 4

What is a mechanoreceptor?

Answer 4

detects mechanical stimuli in the form of pressure and vibrations

Question 5

Give three examples of where the Pacinian Corpuscles are located

Answer 5

fingers, soles of feet, external genitalia

Question 6

What is the connective tissue called in Pacinian Corpuscles?

Answer 6

lamellae

Question 7

In the Pacinian Corpuscle, what is in the cell surface membrane?

Answer 7

stretch-mediated sodium channels

Question 8

What happens when the stretch-mediated sodium channels in the Pacinian Corpuscle have pressure?

Answer 8

they become deformed, and as a result, open and allow the rapid influx of sodium ions to occur

Question 9

In the Pacinian Corpuscle, what does the influx of sodium ions affect?

Answer 9

the +ive charge on the Na ions changes the membrane potential, causing the membrane to become depolarised. resulting in generator potential

Question 10

What is resting potential in a cell?

Answer 10

the membrane is polarised, and there is a difference in charge