The Iris Reflex Flashcards
1
Q
the iris controls…
finish the sentence
A
the ammount of light entering the eye by changing the sise of the pupil.
2
Q
the iris has two types of muscles…
finish the sentence
A
circular muscles and radial muscles.
3
Q
circular muscles form a…
finish the sentence
A
ring shape in the iris
4
Q
radial muscles lie like…
finish the sentence
A
the spokes of a wheel.
5
Q
in bright light the pupil is constricted by…
A
the radial muscles relaxing and the circular muscles contracting.
6
Q
in dim light the pupil is dialated by…
finish the sentence
A
the radial muscles contracting and the circular muscles relaxing.
7
Q
the iris reflex is an example of a…
finish the sentence
A
reflex action
