the blood in the right atrium comes from venous circulation.
the blood in the right atrium comes from venous circulation.
where does the blood in the right atrium come from?
venous circulation
atrium (heart)









































the atrium (latin ātrium, “entry hall”), is the upper chamber through which blood enters the ventricles of the heart. there are two atria in the human heart – the left atrium receives blood from the pulmonary (lung) circulation, and the right atrium receives blood from the venae cavae (venous circulation). the atria receive blood while relaxed (diastole), then contract (systole) to move blood to the ventricles. all animals with a closed circulatory system have at least one atrium. humans have two atria.
atrium (heart)
in an anatomically correct heart the right atrium and right ventricle are working together to supply blood to the pulmonary artery, similarly to how the left atrium and the left ventricle work simultaneously to supply blood to the aorta. during the process of the heart contracting and releasing the right atrium and left atrium contract at the same time, while the left ventricle and right ventricle relax. in opposition, when the left atrium and right atrium are relaxed the left ventricle and right ventricle contract pushing blood to either the aorta or pulmonary artery. in an anatomically correct heart the atria are smaller than the ventricles. the ventricles include more muscle in order to push high quantities of blood throughout the body. normal blood flow throughout the heart begins at the superior vena cava coming from the upper half of the body and the inferior vena cava coming from the lower half of the body. next blood will be in the right atrium and will flow uninterrupted through the tricuspid valve through to the right ventricle. the blood from the right ventricle should go to the pulmonary artery via the pulmonary valve.the blood from the pulmonary vein enters the left atrium, then flows through the mitral valve to the left ventricle. after the left ventricle is filled with blood the aortic valve opens allowing blood to go through, which the blood then enters the aorta and goes to the rest of the body.
crisscross heart