When Muscle Is Stimulated Directly to Contract, Does the Rising

question 24

Multiple Choice

When muscle is stimulated directly to contract, does the rising phase of the twitch begin immediately? If not, why not?

• A)No, electrical and chemical changes at the muscle membrane must occur before contraction.
• B)No, the rising phase occurs only after a substantial number of muscle fibers have contracted.
• C)No, the falling phase of the twitch must occur first.
• D)Yes, it does begin immediately.

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Definitions:

Human Evolution

The lengthy process of change by which people originated from apelike ancestors, spanning millions of years.

Biological Anthropology

The systematic study of humans as biological organisms. Also known as physical anthropology.

Primatology

The scientific study of primates, including humans, their evolution, behavior, and ecology, aiming to understand aspects of our own behavior and biology.

Ethnology

The comparative and analytical study of cultures; a branch of anthropology that examines the cultural variations among humans.