chapter2_2

A. Choose the correct answers.

I Which of the following are examples of reflex actions?I Eyes are shut when an object moves towards themII Hand is withdrawn when it touches a hot objectIII Sneezing occurs when dust enters the nose

A. I and II onlyB. I and II onlyC. II and III onlyD. I, II and III

2 In a reflex action, an impulse is sent to the spinal cord by...

A. a relay neurone.

B. a sensory neurone.

C. a receptor.

D. an effector.

3 The diagram shows a section through the spinal cord.

Neurone cell bodies are found in the part labelled...

4 W h i c h o f t h e f o l l o w i n g statements are correct about a reflex action?I It happens automatically.I I I t is cont ro l led by the cerebrum.III It is important to prevent injury.

A. I and II onlyB. I and III onlyC. II and III onlyD. I, II and III

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5 The information below explains a type of action.

Withdrawal of the leg when it steps on a sharp object

The pathway taken by an impulse in this action is...A. receptor spinal cord effector.B. receptor effector spinal cord.C. receptor brain spinal cord effector.D. effector spinal cord receptor.

6 The f low char t shows the pathway of the impulse of an action.

Which of the following is the action?A. CoughingB. Solving the problemC. Crossing the roadD. Reading a book

7 W h i c h o f t h e f o l l o w i n g activities does not require proprioceptors?A. Reading a bookB. Buttoning the shirt while walkingC. Acrobat walking along a tightropeD. Estimating the weight of an object by holding it

8 The diagram shows an acrobat walking along a tightrope.

Which of the following parts of the body helps the acrobat to balance?I Cerebellum in the brain

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Receptor

Spinal cord

Effector

II Semicircular canals in the earsIII Proprioceptors on the feet

A. I and II onlyB. I and III onlyC. II and III onlyD. I, II and III

9 Proprioceptors are not found in...A. the retina.B. the muscles. C. the joints.D. the tendons.

10 Ah Heng is estimating the weight of two books as shown in the diagram below.

Which of the fol lowing is involved in his action?A. Sensory neuroneB. Motor neuroneC. Relay neuroneD. Proprioceptor

B. Write your answers in the spaces provided.

1 Mei Ling is sitting cross-legged on a chair while Dahlia gives her a knock just below the knee cap with a ruler.

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(a) i. How does Mei Ling react to the knock?

_____________________________________________________________

ii. What is the type of action is this?

_____________________________________________________________

[2 marks]

(b) Complete the diagram below to show how the action happens.

[2 marks]

(c) Write down the path of the impulse which results in Mei Ling's reaction.

(d) Which part of the central nervous system is involved in this action?

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_____________________________________________________________

[1 mark]

2 The diagram below shows the posi t ion of propr ioceptors in the muscles.

(a) What is the function of the part labelled P?

_____________________________________________________________

[1 mark]

(b) i. What is the function of proprioceptors in the muscles?

_____________________________________________________________

[1 mark]

ii. State the pathway of an impulse produced by a proprioceptor during muscle

movement.

[3 marks]

(c) Apart from muscles, name two places in our body that have proprioceptors.

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_____________________________________________________________

_____________________________________________________________

[2 marks]

(d) Give two examples of activity which involve proprioceptors.

1. _______________________________________________________________

2. _______________________________________________________________

[2 marks]

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