Which part of the heart contracts to send the oxygenated blood to the rest of the body?

I think the blood vessels hope this helps

When the ventricle contracts, the blood is pushed into the pulmonary artery that branches into two main parts: one going to the left lung, one to the right lung. The fresh, oxygen-rich blood returns to the left atrium of the heart through the pulmonary veins.

hope this helps better then before

Maybe meditation,stress relievers,try to have quite time try to get school done on time and try to go to bed earlier