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Coordination and response: nervous system — KCSE Biology

KCSE Biology · 86 practice questions · 4 syllabus objectives

25 easy35 medium26 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Draw and label a motor neuron

Describe the transmission of a nerve impulse

Describe a reflex arc with a named example

Coordination and response: nervous system

Sample Questions

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1
easySHORT ANSWER4 marks

State the components of a reflex arc and give a named example. (4 marks)

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Part (a) — 4 marks
Sensory neurone (1 mk)
Relay neurone (1 mk)
Motor neurone (1 mk)
Example: Knee-jerk reflex (1 mk)
2
easySHORT ANSWER3 marks

State how a nerve impulse is transmitted along a neurone. (3 marks)

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Part (a) — 3 marks
Nerve impulse is initiated by a stimulus causing depolarisation of the neurone membrane (1 mk)
Depolarisation triggers the opening of sodium channels, allowing sodium ions to flow into the neurone (1 mk)
The change in ion concentration creates an action potential that propagates along the axon towards the synapse (1 mk)
3
easySHORT ANSWER2 marks

State the function of the myelin sheath in a motor neurone. (2 marks)

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Part (a) — 2 marks
Insulates the axon to prevent loss of electrical impulses (1 mk)
Increases the speed of nerve impulse transmission via saltatory conduction (1 mk)
4

State the main components of a motor neurone. (4 marks)

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Why Practise Coordination and response: nervous system?

KNEC Aligned

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