More cards in this set

What controls the size of the pupil?

What are the antagonistic muscles contained in the iris?

Why are the radial and circular muscles in the iris known as antagonistic?

What controls the radial muscles?

What controls the circular muscles?

Which of the two sets of muscles (radial and circular) cause the pupil to dilate?

How does the pupil constrict?

What is the purpose of the pupil reflex?

The pupil reflex response to light is very rapid. Why does this need to be the case?

Why are neurone cell membranes said to be polarised?