Which of the Following Statements Best Explains What Happens to Cardiac

question 12

Multiple Choice

Which of the following statements best explains what happens to cardiac output when the heart rate gets extremely high?

• A)Cardiac output is not generally affected by rapid heart rates.
• B)Cardiac output lowers when the rapid rate doesn't allow enough time for complete filling of the heart chambers.
• C)Cardiac output will continue to increase as long as the heart rate continues to increase.
• D)Cardiac output will increase until the heart rate reaches 150 bpm,at which time it will no longer be affected.

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Definitions:

Myelin

Fatty material produced by neuroglial cells; insulates axons and thus speeds conduction of action potentials.

Neuroglial Cells

Supportive cells in the nervous system that provide insulation, nutrients, and structural support for neurons, and participate in signal transmission.

Myelin

A fatty covering that insulates nerve fibers in the brain, spinal cord, and peripheral nerves, speeding the transmission of nerve impulses.

Action Potential

A rapid rise and subsequent fall in voltage or membrane potential across a cellular membrane, a process allowing neurons to transmit signals.