Are you using this instead of doing homework? Blood comes back into the heart from the lungs via the Pulmonary vein into the Left Atrium.
The left atrium is the chamber that receives oxygenated blood returning from the lungs.
The left ventricle is the heart chamber that pumps the blood through the aorta to the rest of the body.
The atrium
Arteries carry blood away from the heart.
Deoxygenated Blood
Right atrium then right ventricle.
Atrium
The left atrium
It enters the right chamber called right atrium
the heart
The right chamber pumps blood to the lungs to get oxygen.
The left atrium is the chamber that receives oxygenated blood returning from the lungs.
The chamber where blood first enters the heart is called the right atrium. It receives deoxygenated blood from the body through the superior and inferior vena cavae. From the right atrium, the blood then flows into the right ventricle, which pumps it to the lungs for oxygenation.
Valves prevent the flow of blood into the wrong chamber or its backflow.
Blood returning from the body systemic circulation first enters which chamber of the heart?
The left ventricle is the heart chamber that pumps the blood through the aorta to the rest of the body.
Heart blood vessels is what collects blood and pumps it to the lower chamber. This is what keeps the heart in working function.