Which of these is NOT part of an extrinsic regulatory mechanism of the heart?
A) baroreceptor reflex
B) sympathetic or parasympathetic stimulation of the SA node
C) epinephrine secreted from the adrenal medulla
D) chemoreceptors for oxygen in the medulla oblongata
E) change in venous return

Question

Quizplus · Accepted Answer

Extrinsic regulatory mechanisms of the heart involve external controls that adjust heart function, such as neural and hormonal influences. A) Baroreceptor reflex, B) Sympathetic or parasympathetic stimulation of the SA node, C) Epinephrine secreted from the adrenal medulla, and D) Chemoreceptors for oxygen in the medulla oblongata are all examples of extrinsic controls. E) Change in venous return is considered an intrinsic regulatory mechanism because it directly relates to the heart adjusting its output based on the volume of blood returning to it, without external control.

Which of These Is NOT Part of an Extrinsic Regulatory