eye & nervous system

Question 1

Accommodation

Answer 1

Accommodation or focusing is the adjustment of the lens of the eye so that clear images of objects at different distances are formed on the retina

Question 2

Pupil reflex

Answer 2

Pupil reflex is the involuntary action of the circular and radial muscles in the iris in response to a change in light intensity by changing the size of the pupil.

Question 3

Stimulus

Answer 3

A stimulus is a change in the environment that causes an organism to react

Question 4

Response

Answer 4

A response is a reaction of an organism to a stimulus

Question 5

Involuntary actions

Answer 5

Involuntary actions are automatic body activities not under conscious control

Question 6

Voluntary actions

Answer 6

Voluntary actions are body activities carried out under conscious control

Question 7

Reflex action

Answer 7

A reflex action is an immediate response to a specific stimulus without conscious control

Question 8

Synapse

Answer 8

A synapse is a junction between two neurones