[15 Aug] S4: Prelim Revision II

Which of the following would be a consequence of the optic nerve being cut?

• An image would not be formed on the retina.

• The brain would not be able to send any nerve impulses.

• The photoreceptors of the retina cannot be stimulated.

• The pupil reflex would fail to function.

Which of the following correctly describes a reflex arc?

• the longest pathway by which nerve impulses travel from the receptor to the effector in a reflex action

• the shortest pathway by which nerve impulses travel from the receptor to the central nervous system in a reflex action

• the shortest pathway by which nerve impulses travel from the central nervous system to the effector in a reflex action

• the shortest pathway by which nerve impulses travel from the receptor to the effector in a reflex action

Our eyes feel strained when we read small prints for a long period of time. Which of the following is the correct explanation for the incident described above?

• The ciliary muscles become fatigued.

• The optic nerve will no longer transmit impulses to the brain.

• The retina will no longer record clear images.

• The suspensory ligaments become stretched.

The diagram shows part of the spinal cord and some neurones which are connected to the leg of a patient. Which of the following correctly describes the function of X?

• It connects the receptor to the spinal cord.

• It relays impulses within the central nervous system.

• It relays impulses within the peripheral nervous system.

• It transmits nerve impulses within the spinal cord.

When the pupil of the eye dilates in response to low light intensity, which is the receptor and which is the effector?

• A

• B

• C

• D

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