What is the main function of the myelin sheath on a myelinated axon?
Answer and explanation
Correct answer: A. It speeds up impulses
- Step 1: Myelin insulates the axon, with gaps at the nodes. Step 2. The impulse jumps from node to node, which is saltatory conduction. Answer: it speeds up impulses. Why not the others: Vesicles store transmitter, dendrites receive and pumps restore ions.
Practise more Nervous, endocrine and reproductive systems.
Free questions with an explanation for every one, and full timed Alberta Diploma Exams mock tests.
More Nervous, endocrine and reproductive systems questions
- Which part of a neuron receives signals from other neurons?
- At resting potential, the sodium-potassium pump moves
- During depolarization of an axon membrane, which event occurs?
- Which event causes repolarization?
- What triggers the release of neurotransmitter from vesicles in the axon terminal?
- What does acetylcholinesterase do in a synapse?