Nervous system GA

Sensory neurones transmit nerve impulses from

• the brain and spinal cord to muscles.

• sense organs to muscles.

• one sense organ to another sense organ.

• sense organs to brain and spinal cord.

Three possible directions in which nerve impulses can travel in the nervous system of a mammal are listed below.

 

1          away from the central nervous system

            2          towards the central nervous system

            3          from place to place within the central nervous system

 

In which of these directions do impulses in relay, motor and sensory neurons travel?

• A

• B

• C

• D

Which of the following is not a reflex action?

• pulling away of the hand when touched a hot object

• getting goosebumps when in a cold room

• winking of the eye

• blinking of the eye

Which of the following is not a component of the nervous system in mammals?

• Neurones

• Brain

• Heart

• Spinal cord

The diagram shows a section through the spinal cord and the neurones involved in a reflex action of a hand.

A student has been injured in an accident.

When a sharp point is stuck into one of his fingers, no reflex occurs. However, he can move his fingers when asked to do so.

Where has his nervous system been damaged?

• A

• B

• C

• D

A woman was given an anaesthetic to block either region 1, 2 or 3. She can move her toe but cannot feel the movement.

Which region(s) is/are blocked?

• A

• B

• C

• D