Impulses travel very rapidly along nerves from the leg muscles of a mammal because:
Correct answer: B. The nerves contain myelinated fibers
- A. There is a high concentration of Na+ ions inside the axons
- B. The nerves contain myelinated fibers
- C. There is a potential difference across; the axon membranes
- D. The cell bodies of the fibers are contain within the dorsal root ganglion
Explanation
In summary, the rapid transmission of nerve impulses in mammalian leg muscles is primarily due to the presence of myelinated fibers in the nerves. The myelin sheath allows for saltatory conduction, significantly speeding up the propagation of nerve impulses along the axons.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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