Answer:Blood circulates in a loop driven by the heart's pumping action, moving from the heart to the lungs for oxygenation and then to the rest of the body. Arteries carry oxygenated blood away from the heart, while veins return deoxygenated blood. Capillaries facilitate gas exchange and nutrient delivery. Blood pressure maintains circulation, and the lymphatic system helps with fluid balance and immune function. Understanding blood flow is essential for appreciating the body's efficiency in delivering oxygen and nutrients while removing waste.