The diagram shows part of a reflex arc. (i) Name neurons A, B and C. (ii) In which direction is the impulse transmitted A → B → C or C → B → A? (iii) Name the small gaps between neurons. (iv) Neurons produce neurotransmitter substances. What is their function? (v) Give an example of a reflex action in humans. (vi) Why are reflex actions important in humans?

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The diagram shows part of a reflex arc - Leaving Cert Biology - Question a - 2007

Question a

The diagram shows part of a reflex arc. (i) Name neurons A, B and C. (ii) In which direction is the impulse transmitted A → B → C or C → B → A? (iii) Name the sma... show full transcript

Worked Solution & Example Answer:The diagram shows part of a reflex arc - Leaving Cert Biology - Question a - 2007

Step 1

Name neurons A, B and C.

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Answer

Neuron A is a sensory neuron, neuron B is an inter-neuron (relay neuron), and neuron C is a motor neuron.

Step 2

In which direction is the impulse transmitted A → B → C or C → B → A?

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Answer

The impulse is transmitted in the direction A → B → C.

Step 3

Name the small gaps between neurons.

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Answer

The small gaps between neurons are called synapses.

Step 4

Neurons produce neurotransmitter substances. What is their function?

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Answer

The function of neurotransmitter substances is to carry impulses across the synaptic gap between neurons.

Step 5

Give an example of a reflex action in humans.

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Answer

An example of a reflex action in humans is the withdrawal reflex when touching a hot surface.

Step 6

Why are reflex actions important in humans?

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Answer

Reflex actions are important in humans because they provide a fast response or defense mechanism against injury.

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