reflex arc Flashcards
1
Q
what are reflex actions like
A
fast, automatic and involuntary
2
Q
what does the reflex arc do
A
prevent injury by bypassing conscious part of brain
3
Q
what do the neurones in reflex arcs go through instead of the brain
A
the spinal cord (some go through unconscious part of brain)
4
Q
what is the pathway of impulses
A
sensory neurone, relay neurone, motor neurone
5
Q
where are the relay neurones
A
CNS
6
Q
how does a reflex arc protect the eye
A
light receptors in the eye detect the bright light and send a message through sensory neurone
motor neurone - tells circular muscles in the iris to contract (pupil become smaller)
