Pressure receptors Flashcards
Draw the flow chart stimulated when a receptor detects a stimulus
stimulus > receptor > coordinator > effector > response
What 2 sections make up the nervous system?
Central (CNS) and Peripheral (PNS)
What part of the nervous system are receptors a part of?
PNS
What is a receptor?
a cell that responds to a specific stimuli, leading to the establishment of a generator potential that causes a response
What does the influx of Na+ ions have to raise the V above in order to stimulate a response?
-55 mV
What receptor responds to pressure?
Pacinian corpuscle
Where do Pacinian Corpuscle often occur?
deep in skin, fingers and feet
What does a Pacinian Corpuscle consist of?
a single sensory neurone wrapped in layers of connective tissue separated with gel
What channel proteins are in the cell membranes of Pacinian Corpuscle receptors?
stretch mediated sodium channels
When do stretch-mediated sodium channels allow Na+ ions in?
when they are deformed/ stretched, which occurs as a result of pressure
Explain how Pacinian corpuscle receptors detect changes in pressure
cell membranes contain stretch-mediated sodium channels
when pressure is applied, these channels stretch (widen) which allows Na+ ions to diffuse in, making the inside of the neurone more positive, which if positive enough an action potential will occur
What does a greater pressure result in?
more Na+ ions entering
