What are the three main components of the circulatory system?

Question

Quizplus · Accepted Answer

The three main components of the circulatory system are the heart, blood vessels, and blood. The heart pumps the blood, the blood vessels carry the blood, and the blood itself carries nutrients, oxygen, and waste products throughout the body. Choice A is incorrect because it only includes arteries and veins, which are types of blood vessels. Choice B is incorrect because lymph is not a component of the circulatory system, but rather a part of the immune system. Choice D is incorrect because the lungs are not a component of the circulatory system, but rather a part of the respiratory system. Choice E is incorrect because smooth muscle is a type of muscle found in blood vessels, but it is not a component of the circulatory system on its own.

What Are the Three Main Components of the Circulatory System