Pressure Receptors

Question 1

Draw the flow chart stimulated when a receptor detects a stimulus

Answer 1

stimulus > receptor > coordinator > effector > response

Question 2

What 2 sections make up the nervous system?

Answer 2

Central (CNS) and Peripheral (PNS)

Question 3

What part of the nervous system are receptors a part of?

Answer 3

PNS

Question 4

What is a receptor?

Answer 4

a cell that responds to a specific stimuli, leading to the establishment of a generator potential that causes a response

Question 5

What does the influx of Na+ ions have to raise the V above in order to stimulate a response?

Answer 5

-55 mV

Question 6

What receptor responds to pressure?

Answer 6

Pacinian corpuscle

Question 7

Where do Pacinian Corpuscle often occur?

Answer 7

deep in skin, fingers and feet

Question 8

What does a Pacinian Corpuscle consist of?

Answer 8

a single sensory neurone wrapped in layers of connective tissue separated with gel

Question 9

What channel proteins are in the cell membranes of Pacinian Corpuscle receptors?

Answer 9

stretch mediated sodium channels

Question 10

When do stretch-mediated sodium channels allow Na+ ions in?

Answer 10

when they are deformed/ stretched, which occurs as a result of pressure

Question 11

Explain how Pacinian corpuscle receptors detect changes in pressure

Answer 11

• lamellae are deformed
• membrane on neurone is deformed/stretched
• stretch-mediated sodium channels change shape
• Na+ diffuses into cell
• leads to a generator potential

Question 12

What does a greater pressure result in?

Answer 12

more Na+ ions entering