Receptors Flashcards
What is the name of the receptor that is triggered by mechanical pressure?
Pacinian Corpuscle
How many stimuli are receptors specific to?
one
Where are most Pacinian Corpuscle found?
in the dermis of the skin or joints/ligaments/tendons
What does a Pacinian Corpuscle act as?
What does it produce?
Acts as a transducer by producing a generator potential
Define transducer
change energy into electrical impulses
The greater the pressure the ______
greater the freq. of impluses along the neurone
Describe how the Pacinian Corpuscle produces an impulse
@ resting state the Stretch-mediated Na channels of membrane aoudn the neurone of the PC are too narrow to let Na pass
when pressure is added the PC membrane gets deformed and stretches so Na ions can diffuse in
This depolises the membrane
The generator potential generates and action potential which send impuse from neurone to the CNS
What are the two types of cell in the eye?
Rod Cells
Cone Cells
Why do Rod cells only produce black and white images?
Cannot not distingish between types of light due to retinal convergence ( more then one Rod cell shares a bipolar neurone)
What type of visual acuity do Rod cells give and why?
Rod cells give low visual acuity as more then one Rod cell shares a bipolar neurone
How many types of Cone cells are there?
What do they respond to?
Three Types
They respond to a differnt type of light wavelength
Why do cone cells produce coloured image?
one cell per neuron
What type of visual acuity do Cone cells give and why?
High Visual Acuity due to one cell per neuron
Which type of eye cells are most effective in low light intensities?
Rod Cells
Which type of eye cells are most effective in high light intensities?
Cone Cells
