Pancinian Corpuscle

Question 1

Are sensory receptors specific

Answer 1

Yes one type of receptor can only receive and process one type of stimulus. I.e. thermoreceptors can only detect and process changes in temp, say not salinity.

Question 2

What do sensory receptors act as

Answer 2

Transducers - things that can turn stimulus into electrical impulse. This impulse is the generator potential.

Question 3

What are the 4 types of sensory receptors

Answer 3

Mechanoreceptoes - pressure and motion
Chemoreceptors - chemicals
Thermoreceptors - heat
Photoreceptors - light

Question 4

Where is parscimiam corpuscle

Answer 4

In fingertips and feet and stuff and are sensitive to pressure and movement.

Question 5

What surrounds the corpuscle

Answer 5

Layers of connective tissues with gel in between each layer to help transmit any vibration

Question 6

What’s on the end of the parscinian corpuscle

Answer 6

Stretch mediated sodium channels - so they are sensitive to changes in their physical structure and only allow sodium ions inside or out

Question 7

What’s at a resting state (properties)

Answer 7

The stretch mediated sodium ion channels are closed so conc outside is high - maintaining a resting potential of -70mV. Membrane is polarised

Question 8

What happens once pressure is applied to corpuscle

Answer 8

Blud indents and physically changes the corpuscle shape and the sodium ion channels are stretched open. Now high conc outside so sodium ions rush in, depolarising the membrane. Initiating generator potential and when enough come in, an action potential is triggered causing signal to be sent along the neurone and along the pathway of sex