Where do the absorption of nutrients and the exchange of respiratory gases between the blood and body tissues occur?

The heart is the body's pumping organ. It pumps blood continuously without taking a pause. It receives blood through the veins and transports oxygen-rich blood to the other parts of the body with the help of the arteries.

Capillaries are small and fine blood vessels that are found all over the body. They connect arteries to veins. They transport oxygen and nutrients to the cells and collect carbon dioxide and waste.