The Nervous System

What does the central nervous system consist of?

• brain, spinal cord and peripheral nerves   

• brain and spinal cord only

• brain only

• spinal cord and peripheral nerves only

Which diagram below shows a sensory neurone?

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The diagram shows the structures in a reflex arc. What is the sequence of nerve cells through

which an impulse passes during a reflex action?

• P --> Q --> R

• Q --> R --> P

• Q --> P --> R

• R --> P --> Q

Sensory neurones conduct impulses from......

• the brain and spinal cord to muscles.  

• one sense organ to another sense organ.

• sense organs to the brain and spinal cord.

• muscles to sense organs.

Which structure contains relay neurones?

• spinal cord

• muscle

• gland   

• synapse

A man injures his arm in an accident. Afterwards, he can move his hand but cannot feel objects touching his hand. What could cause this?

• Both sensory and motor neurones are cut.  

• Sensory neurones are cut.

• Motor neurones are cut.

• Effectors are damaged.