COORDINATION AND RESPONSE

The diagram shows a section of a human eye focused on a near object

• W, X, Y

• V, X, Z

• W, X, Z

• V, Y, Z

The diagram shows a section though the human eye.

Where will an image be detected when a person looks at the object?

• A

• B

• C

• D

What structures cover the pupil of a human eye?

• Conjunctiva and cornea

• Conjunctiva and sclera

• Cornea and retina

• Retina and sclera

The diagram shows a section though a human eye. Which structure contains the muscles which contract to produce a focused image on the retina?

• A

• B

• C

• D

What happens to these structures when focusing on an object near the eye?

• A

• B

• C

• D

The diagram shows the human eye in section. There are circular muscles at X and Y.

What happens to the circular muscles at X and Y when the eye focuses on a near object in bright light?

• X: contract

  Y: contract

• X: contract

  Y: relax

• X: relax

  Y: contract

• X: relax

  Y: relax

A person is sitting in a dark room. What happens in the eye when a light is switched on?

• circular muscle of iris: contract

  size of pupil: decreases

• circular muscle of iris: contract

  size of pupil: increases

• circular muscle of iris: relaxes

  size of pupil: decreases

• circular muscle of iris: relaxes

  size of pupil: increases

Which is not controlled directly by the nervous system?

• Blood glucose concentration

• Dilation of the blood vessels

• Heart rate

• Pupil diameter in the eye

The diagram shows a section through the eye. Which pair of structures focus light rays onto the retina.

• P and Q

• P and R

• Q and R

• Q and S

The diagram shows a section through a human eye. Which structure contains muscle fibres that contract in response to sudden changes in light intensity?

• A

• B

• C

• D