While learning about the cardiovascular system in the prenursing anatomy and physiology class, the students are studying positive chronotropy. What is this?
A) The force of myocardial contraction
B) The constriction of peripheral blood vessels
C) Conduction through the AV node
D) Stimulation of the sympathetic system that increases heart rate
Ans: D
Feedback: The heart rate is influenced by the autonomic nervous system, which consists of sympathetic and parasympathetic fibers. Sympathetic nerve fibers (also referred to as adrenergic fibers) are attached to the heart and arteries as well as several other areas in the body.
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