Which chamber of the heart exits into the pulmonary trunk?

Answer: the right ventricle

Explanation:

The pulmonary trunk originates from the right ventricle through which deoxygenated blood is pumped into the lungs.

The pulmonary trunk divides into right and left pulmonary artery which carries blood to their respective lungs.

Blood flow into the pulmonary trunk is regulated by the semilunar valve.