A Neurophysiologist Is Investigating Reflexes in Two Different Animals: a Crab

question 7

Multiple Choice

A neurophysiologist is investigating 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 a likely explanation?

• A) The fish's axons are smaller in diameter than the axons in the crab.
• B) The fish's axons are myelinated. The crab's axons are not myelinated.
• C) The fish's axons are not myelinated. The crab's axons are myelinated.
• D) There is a higher percentage of ion channels in the axons of the crab compared with the percentage of ion channels in fish axons.

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Definitions:

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Marginal Tax Rate

The rate at which the last dollar of income is taxed, reflecting the percentage of tax paid on any additional income earned.

Retained Earnings

The portion of net income not distributed to shareholders but reserved by the company to reinvest in its core business or to pay debt.