Which structure carries blood to the heart so the heart has its own supply of oxygen and nutrients to perform its function? pulmonary artery coronary arteries superior vena cava inferior vena cava

The coronary arteries are the blood vessels responsible for producing the pumping action of the heart. The heart has its own vascular system called coronary circulation. This is where coronary arteries that originated from the aorta supply oxygen-rich blood to the entire muscles of the heart making it pump efficiently. The heart is designed to have a small portion on the right as compared to the left because the right side of the heart only supplies blood to the lungs while the left side supplies blood throughout the whole body.

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.