Which of these events happens when the heart is sympathetically stimulated
A)ESV increases.
B)Norepinephrine is released from neurons.
C)K2+ channels open in greater numbers.
D)Cardiac output decreases.

Question

Quizplus · Accepted Answer

When the heart is sympathetically stimulated, norepinephrine is released from neurons as part of the fight or flight response. This results in an increase in heart rate and contractility. ESV (end-systolic volume), on the other hand, decreases due to the increased contractility, so option A is incorrect. Option C is also incorrect since the opening of K2+ channels is more associated with parasympathetic stimulation. Lastly, cardiac output increases with sympathetic stimulation, so option D is incorrect.

Which of These Events Happens When the Heart Is Sympathetically