Which of the Following Statements About the Absolute Refractory Period

question 49

Multiple Choice

Which of the following statements about the absolute refractory period of cardiac muscle cells is TRUE?

• A) It lasts for the same length of time in cardiac muscle cells as it does in skeletal muscle cells.
• B) It is much longer than the refractory period of skeletal muscle cells.
• C) It allows for tetanic contractions of the heart to occur to assure smooth, coordinated ejection of blood from the ventricles.
• D) Ventricular muscle cells are in the absolute refractory period from the beginning of contraction until the beginning of their next contraction.
• E) During the absolute refractory period, a larger-than-normal stimulus will result in a premature ventricular contraction.

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Definitions:

Evolutionary Psychologists

Professionals who study how evolutionary principles help explain the structure and function of the human mind.

Evolutionary Mechanisms

Describes the processes by which organisms change over time through adaptation, natural selection, and genetic variation.

Natural Selection

The process whereby organisms better adapted to their environment tend to survive and produce more offspring.

Genetic Variations

Differences in DNA sequences among individuals, which contribute to the diversity of traits and characteristics within a population.