When venous return increases, the heart contracts more forcefully. This is called:
A)Starling's law of the heart, and it decreases cardiac output
B)the venous reflex, and it decreases cardiac output
C)Starling's law of the heart, and it increases cardiac output
D)the venous reflex, and it increases cardiac output

Question

Quizplus · Accepted Answer

According to Starling's law of the heart, when venous return increases, the heart contracts more forcefully, which leads to an increase in stroke volume and ultimately increases cardiac output. Thus, choice C is the correct answer. Choice A is incorrect because Starling's law of the heart does not decrease cardiac output but rather increases it. Choice B is also incorrect because the venous reflex does not exist, and even if it did, it would likely not increase cardiac output. Choice D is also incorrect because there is no such thing as the venous reflex, and even if there were, it would not necessarily increase cardiac output.

When Venous Return Increases, the Heart Contracts More Forcefully