Question

Where does oxygen-rich blood from the lungs enter the heart?

Answer 1

Left Atrium.

Explanation:

The human heart has four chambers :

1. Right atrium
2. Left atrium
3. Right ventricle
4. Left ventricle.

The oxygen-poor blood from the whole body enters the Right Atrium and this blood flows into Right Ventricle. From there, this blood is transported to the lungs.

The lungs enrich the blood with oxygen. And then the oxygen-rich blood enters the Left Atrium of the heart, from the lungs, via four pulmonary veins.

From the Left Atrium, blood enters the Left ventricle, which pumps the oxygen-rich blood to the whole body through the aorta and the arterial system.