Multiple Choice
Which of the following mechanisms play(s) a role in regulating heart rate?
A) chemical messengers in the blood,such as epinephrine
B) nerves originating from the medulla (lower part of the brain)
C) pacemaker cells within the heart
D) chemical messengers in the blood,such as epinephrine;nerves originating from the medulla (lower part of the brain) ;and pacemaker cells within the heart
E) chemical messengers in the blood,such as epinephrine,and pacemaker cells within the heart
Correct Answer:
Verified
Correct Answer:
Verified
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