the eye

Question 1

explain the reflex arc

Answer 1

The sensory receptors in your finger detect the stimulus
The sensory neuron carries the impulse to the relay neurone
The relay neuron then has the impulse to the effector neurone
The effector neurone causes the effector (muscle) to contract, moving the finger away from the hot object

Question 2

what is cornea used for

Answer 2

to refract light

Question 3

how does an eye change in bright light

Answer 3

radial muscles relax
circular muscles contract

(opposite for dark)

Question 4

how does an eye change when objects are close

Answer 4

lens need to be short and fat (curved)
suspensory ligaments slacken
ciliary muscles contract

Question 5

how does an eye change shape when objects are far

Answer 5

lens need to be wide
suspensory ligaments are stretched
ciliary muscles relax

Question 6

lens for short sightedness

Answer 6

concave lens

Question 7

lens for long sightedness

Answer 7

convex lens