Asked by Nicole Ruffner on May 11, 2024
Verified
Which of the following factors would cause an increase in heart rate?
A) Increased parasympathetic stimulation
B) Stimulation of baroreceptors in the aorta
C) Increased epinephrine release from the adrenal medulla
D) Increased production of atrial natriuretic factor
E) Stimulation through the vagus nerve
Epinephrine Release
Epinephrine release involves the secretion of the hormone epinephrine (adrenaline) from the adrenal medulla, triggering the body's fight-or-flight response.
Heart Rate
Heart rate is the number of heartbeats per unit of time, typically expressed as beats per minute (BPM), indicating cardiovascular health and efficiency.
- Acquire insight into the role of the autonomic nervous system in regulating heart rate and myocardial contractility.
Verified Answer
SL
sarai lumwaiMay 12, 2024
Final Answer :
C
Explanation :
Increased epinephrine release from the adrenal medulla directly stimulates the heart to increase heart rate as part of the "fight or flight" response, enhancing cardiac output to meet the body's increased demand for oxygen and nutrients.
Learning Objectives
- Acquire insight into the role of the autonomic nervous system in regulating heart rate and myocardial contractility.
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