Which factor is primarily responsible for the difference between the speed of somatic transmission and autonomic transmission of nerve impulses?
1. Abundance of ganglia
2. Presence of myelin
3. Absence of acetylcholine
4. Availability of neuronal tissue
Correct Answer: 2
Rationale 1: Ganglia are absent in somatic nerves.
Rationale 2: The presence of myelin allows for movement of impulses more quickly than autonomic transmission.
Rationale 3: Absence of acetylcholine is unrelated to the speed of transmission.
Rationale 4: Availability of neuronal tissue is unrelated to the speed of transmission.
Global Rationale: The presence of myelin allows for movement of impulses more quickly than autonomic transmission. Ganglia are absent in somatic nerves. Absence of acetylcholine and availability of neuronal tissues are both unrelated to the speed of transmission.
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