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Examine Figure 1 - VCE - SSCE Biology - Question 3 - 2003 - Paper 1
Question 3
Examine Figure 1. a. What kind of neuron is neuron M? b. The skin shown in Figure 1 is associated with a reflex arc. Outline the response that such a reflex arc co... show full transcript
Worked Solution & Example Answer:Examine Figure 1 - VCE - SSCE Biology - Question 3 - 2003 - Paper 1
Step 1
Step 2
The skin shown in Figure 1 is associated with a reflex arc. Outline the response that such a reflex arc controls and explain its importance for the body.
Answer
A reflex arc involves an automatic response that occurs without the involvement of the brain. This response typically controls actions such as pulling away from a painful stimulus. Such reflexes are important for the body as they allow for quick reactions to harmful situations, thereby preventing injury and ensuring survival.
Step 3
In what way does the presence of a myelin sheath affect the function of a nerve cell?
Answer
The myelin sheath increases the rate of conduction of a nerve impulse along the axon. This is because myelinated axons allow for saltatory conduction, where the nerve impulse jumps between the nodes of Ranvier, making transmission more efficient and faster compared to unmyelinated axons.