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2.1 Identify the type of neuron shown - NSC Life Sciences - Question 2 - 2021 - Paper 1
Question 2
2.1 Identify the type of neuron shown. 2.1.2 Using the LETTERS A, B and C, give the correct sequence for the transmission of an impulse along neuron 1. 2.1.3 Expla... show full transcript
Worked Solution & Example Answer:2.1 Identify the type of neuron shown - NSC Life Sciences - Question 2 - 2021 - Paper 1
Step 1
Step 2
Using the LETTERS A, B and C, give the correct sequence for the transmission of an impulse along neuron 1.
Answer
The correct sequence for the transmission of an impulse along neuron 1 is C → B → A. This indicates that the impulse first travels from the axon terminals (C) to the cell body (B) and then moves along the dendrites (A).
Step 3
Explain how the speed of transmission of impulses will differ for neuron 1 and neuron 2.
Answer
The speed of transmission of impulses will be faster in neuron 1 compared to neuron 2. This is due to the presence of a myelin sheath in neuron 1, which insulates the axon and allows for faster saltatory conduction. In contrast, neuron 2 lacks this myelin sheath, leading to slower impulse transmission.
Step 4
Explain why a person will feel the stimulus but will not be able to respond if only this type of neuron is damaged.
Answer
If the motor neuron is damaged, the person will still be able to feel the stimulus due to the functioning sensory neurons that transmit signals to the brain. However, the motor neuron, which relays signals from the brain to muscles for a response, is compromised. As a result, while the sensation of feeling the stimulus persists, the inability to initiate a muscle response will occur.