The diagram below represents a neuron in a human - NSC Life Sciences - Question 3 - 2016 - Paper 1
Question 3
The diagram below represents a neuron in a human.
3.1.1 Identify the type of neuron represented in the diagram.
3.1.2 State ONE function of p... show full transcript
Worked Solution & Example Answer:The diagram below represents a neuron in a human - NSC Life Sciences - Question 3 - 2016 - Paper 1
Step 1
Identify the type of neuron represented in the diagram.
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Answer
The type of neuron represented in the diagram is a motor neuron. Motor neurons transmit impulses from the central nervous system to the effectors.
Step 2
State ONE function of part B.
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Answer
Part B, also known as the axon, transmits the electrical impulse away from the cell body to the synapse where it triggers neurotransmitter release.
Step 3
Explain the role of part C in the functioning of the neuron.
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Part C, identified as the myelin sheath, insulates the neuron. This insulation allows for faster transmission of electrical impulses along the axon, and prevents short-circuiting, enhancing the efficiency of nerve signal conduction.
Step 4
Explain the consequence for a reflex action if the neuron shown in the diagram is damaged.
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If the neuron shown in the diagram is damaged, it may disrupt the transmission of nerve impulses. This can result in an inability to respond to stimuli, as the reflex arc can be interrupted. Specifically, the nerve impulses will not reach the effector (muscle or gland), leading to a delayed or absent reflex response.
