Which components make up the circulatory system?

The components that make up the circulatory system are primarily the heart, arteries, and veins. The heart is the central organ responsible for pumping blood throughout the body, supplying oxygen and nutrients while removing waste products. Arteries carry oxygen-rich blood away from the heart to various tissues and organs, while veins return deoxygenated blood back to the heart.

In contrast, the other options listed do not pertain to the circulatory system. The first option mentions the respiratory system components, which facilitate gas exchange—lungs, mouth, throat, trachea, and bronchi work together for breathing and oxygen intake. The second option refers to parts of the digestive system—mouth, esophagus, stomach, and gallbladder are involved in the processing and digestion of food, not in transporting blood or oxygen. Therefore, the heart, arteries, and veins are exclusively responsible for the functions of the circulatory system.