What are the basic principles of circulation?

The basic principles of circulation involve the movement of blood through the heart and blood vessels, driven by pressure differences. Blood is pumped from the heart into arteries, which carry it to various body tissues, where oxygen and nutrients are exchanged for waste products. The deoxygenated blood then returns to the heart through veins, completing the circuit. This continuous flow is essential for maintaining homeostasis and supporting cellular functions throughout the body.