Question

which chamber of the heart contracts and sends blood into the pulmonary trunk? right atrium left ventricle left atrium right ventricle i dont know yet

Explanation:

The right ventricle contracts and pumps de - oxygenated blood into the pulmonary trunk, which then distributes the blood to the lungs for oxygenation. The right atrium receives de - oxygenated blood from the body. The left atrium receives oxygenated blood from the lungs. The left ventricle pumps oxygenated blood into the aorta for distribution to the body.

Answer:

Right ventricle