Receptors

Question 1

Explain why an image formed at the fovea is perceived in more detail than an image formed at any other point on the retina [2]

Answer 1

The fovea has many / only cones / more cones than rest of the retina;


which each synapse to a single neurone / bipolar cell / no
retinal convergence;


OR

The rest of the retina has mainly rods/more rods than cones;

which share/converge on neurones/bipolar cells;

Question 2

Describe how a Pacinian corpuscle produces a generator potential when stimulated.

Answer 2

(Increased pressure) deforms/changes stretch-mediated
sodium ion channel;

(Sodium channels open and) sodium ions flow in;

Depolarisation (leading to generator potential);