Which of the Following Medications Increases Heart Rate by Accelerating

question 32

Multiple Choice

Which of the following medications increases heart rate by accelerating the SA node discharge rate and blocking the vagus nerve?

• A) Digitalis
• B) Atropine
• C) Amiodarone
• D) Beta-blocker

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Definitions:

Sarcomere

The basic contractile unit of muscle fiber, consisting of actin and myosin filaments between two Z lines.

Z Disk

Delicate, membranelike structure found at each end of a sarcomere to which actin myofilaments attach.

T Tubule

T Tubules, or transverse tubules, are extensions of the cell membrane that penetrate into the center of skeletal and cardiac muscle cells, playing a crucial role in muscle contraction.

Sliding Filament Model

A theory describing the mechanism of muscle contraction, where actin and myosin filaments slide past each other to shorten the muscle fiber length.