Blood Returning to the Heart from the Pulmonary Circuit First

Question

Blood returning to the heart from the pulmonary circuit first enters the
A) right atrium.
B) right ventricle.
C) left atrium.
D) left ventricle.
E) conus arteriosus.

Accepted Answer

Blood returning from the pulmonary circuit (lungs) first enters the left atrium of the heart. This is because the pulmonary veins carry oxygenated blood back to the left atrium, from where it is then pumped into the left ventricle and subsequently to the rest of the body.