The three main components of the circulatory system are the ____, the blood vessels, and the blood.

The three main components of the circulatory system include the heart, blood vessels, and blood, making the heart a fundamental part of this system. The heart functions as a pump, continuously circulating blood throughout the body, delivering oxygen and nutrients to tissues, and removing waste products. This essential role makes the heart indispensable for maintaining homeostasis and supporting overall bodily functions.

The other options, while related to the circulatory system, do not represent the primary components in the same way that the heart does. The aorta is one of the blood vessels, but it does not encompass the entire blood vessel system. The stomach is part of the digestive system and does not play a direct role in circulation. Coronary arteries are specific blood vessels that provide blood to the heart muscle itself rather than being a component of the circulatory system as a whole. Therefore, the heart is correctly identified as one of the three main components, along with blood and blood vessels, highlighting its critical role in the circulatory system.