Receptors Flashcards
What are the three main receptors?
Cone, Rod, Pacinian corpuscle.
What does the Pacinian corpuscle receptor detect?
Changes in Pressure
What does the Pacinian corpuscle have on the end of the neuron?
Many membranes wrapped around that contain stretched mediated sodium channels.
So what happens when the Pacinian corpuscle detects a change in pressure?
This pressure deforms and stretches the sensory neuron in which the membranes are also stretched/Deformed which provides for the sodium ions to pass through which generate a response.
Explain what do ROD cells and CONE cells detect.
Rod cells detect light, Cone cells detect color.
What is the name when a bunch of ROD cells connect to one sensory neuron?
Retinal convergence
Because ROD cells have retinal convergence what does that do?
This provides a low visual acuity, meaning low sharpness and detail, its why you cant see specific things in the dark.
What are the three types of CONE cells?
Red, blue and green.
Why do CONE cells need high light intensity for them to do their job?
This is because the iodopsin pigment uses this high light intensity to break down, to trigger the sensory neuron.
How does the cone cells differ from rod cells in terms of retinal convergence.
Cone cells do not have retinal convergence as each cone cell is connected to a singular sensory neuron which give it a higher visual acuity.
Why are we not able to see clearly in darkness?
This is because only our rod cells work which have low visual acuity therefore only giving limited sharpness in vision.
Where are most cone cells found in the eye?
A place in the retina called fovea.
Why is the most place for cone cells the fovea?
This is because more light shines through the eye and hits the fovea directly, and so cone cells need this high light intensity to break down the iodopsin.
What about the distribution of rod cells and explain why it is like that.
Rod cells are scattered across the retina as it can even detect very low intensities of light.
