Question

blood entering the right atrium comes from what structure(s)?
multiple choice
pulmonary veins
venae cavae and coronary sinus
pulmonary trunk
right ventricle

Explanation:

The venae cavae (both superior and inferior) carry de - oxygenated blood from the body to the right atrium, and the coronary sinus drains de - oxygenated blood from the heart muscle itself into the right atrium. Pulmonary veins carry oxygenated blood to the left atrium, the pulmonary trunk is the vessel that takes blood from the right ventricle to the lungs, and the right ventricle receives blood from the right atrium, not the other way around.

Answer:

B. Venae cavae and coronary sinus