Which system is responsible for circulating blood throughout the body?

The cardiovascular system is the primary system responsible for circulating blood throughout the body. It comprises the heart, blood vessels, and blood itself. The heart functions as a pump that propels blood through a network of arteries and veins. This circulation is essential for transporting oxygen and nutrients to the cells and removing waste products from them. The system also plays a crucial role in regulating body temperature and maintaining homeostasis.

In contrast, the endocrine system is involved in hormone production and regulation, influencing various bodily functions but not directly responsible for blood circulation. The digestive system is focused on breaking down food and absorbing nutrients, while the musculoskeletal system provides structure and movement but does not transport blood. Hence, the cardiovascular system is specifically designed for blood circulation, making it the correct answer to the question.