What he said ^^is correct i researched it
1. Atrium
2. Ventricle
3.left ventricle
4. they pump blood throughout the body
5.superior vena cava
6. Pulmonary vein
7.Four heart valves control the flow of blood through the heart. They act as one-way doors, opening to let blood exit or enter a chamber, then closing to keep blood from flowing backward.
The answer is chemical energy
The correct answer is a vacuole