A neurophysiologist is investigating nerve reflexes in two different animals: a crab and a fish.Action potentials are found to pass more rapidly along the fish's neurons.What is the most likely explanation?

Question

Quizplus · Accepted Answer

Myelin is a fatty substance that wraps around axons and speeds up the transmission of action potentials. The presence of myelin in the fish's axons likely contributes to the faster transmission of nerve impulses compared to the crab. Option A is incorrect because larger axons typically transmit signals faster than smaller axons. Option C is incorrect because more ion channels would not necessarily increase the speed of action potential transmission. Option D is partially correct but includes an incorrect statement about small axons transmitting action potentials faster than large ones. Option E is irrelevant to the question.

A Neurophysiologist Is Investigating Nerve Reflexes in Two Different Animals