Four pulmonary veins, which are two from each lung, enter the left atrium of the heart. Oxygenated blood is contained in these veins that then drain into the left atrium.
When blood that is rich in oxygen re enters the heart, the blood enters through the pulmonary valve. The pulmonary valve brings the oxygen rich blood to the pulmonary trunk of the pulmonary artery.
When blood leaves the lungs through the pulmonary veins, it returns to the heart and enters the left ventricle.
The pulmonary vein enters the left atrium of the heart.
Oxygenated blood enters the left side of the heart (atria) via the pulmonary veins
The smallest heart chamber is the left atrium. The right atrium is slightly larger than the left.
In the heart, there are four chambers. (1) The left atrium, where oxygenated blood enters from the lungs, (2) the left ventricle, where blood flows after the left atrium, (3) the right atrium, where deoxygenated blood returns to the heart via the vena cava, and (4) the right ventricle, where blood is sent back to the lungs via the pulmonary artery.
In the pulmonary circuit, blood flows from the pulmonary veins into the left atrium of the heart. The pulmonary veins carry oxygenated blood from the lungs back to the heart, where it enters the left atrium before being pumped into the left ventricle and distributed to the rest of the body.
The heart has 4 chambers and blood comes into the heart through 2 of those chambers and exits through the other 2. Oxygen-poor blood enters the heart from the inferior vena cava and superior vena cava, into the right atrium. From there, the blood passes the tricuspid valve and enters the right ventricle. From there, the blood is pumped through the pulmonary valve into the pulmonary arteries and goes to the lungs to dispose of carbon dioxide and collect oxygen. On the left side of the heart, oxygen-rich blood arrives from the lungs via the pulmonary veins where it passes the mitral valve to enter the left ventricle. From there, the blood is pumped through the aortic valve into the aorta.
The left atrium and left ventricle of the heart contain oxygen-rich blood. Oxygen-rich blood is carried to these chambers from the lungs through the pulmonary veins.
Blood returning from systemic circulation enters the heart at the right atrium. Blood from the pulmonary circulation enters the left atrium.
Through the inferior and superior vena cavaThe left atria of the heart is where oxygenated blood enters, it is then pumped to the left ventricle and then to the rest of the body thru the systematic circuit. The heart is separated by the septum, which separates oxygenated and deoxygenated blood.
In the pulmonary circulation, deoxygenated blood leaves the right section of the heart through the pulmonary artery, enters the lungs and oxygenated blood comes through the pulmonary veins. The blood then moves to the left atrium of the heart.