Systemic circulation begins and ends at the left side of the heart, in the left atrium and left ventricle.
Pulmonary circulation begins in the right ventricle of the heart, where blood is pumped to the lungs to pick up oxygen. It ends in the left atrium, where oxygenated blood returns from the lungs to be pumped out to the rest of the body.
As the Circulatory System is a closed system, it has no beginning or end. Therefore the blood is in continuous circulation.
Its contraction pushes blood into the aorta and then it goes to all the body tissues in the systemic circuit down to the capillary level. From here, the blood is picked up by the capillaries that lead to venules, and then to veins and brought back to the heart's right atrium. This is the end of the systemic circuit and the beginning of the pulmonary circuit starts in the right atrium.
Chambers's Edinburgh Journal ended in 1956.
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The systemic circuit ends at the vena cava, the largest vein in the body, which carries deoxygenated blood from the body back to the right atrium of the heart.
Chambers Street - IRT Sixth Avenue Line - ended in 1938.
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The two large chambers at the bottom of the heart are the left and right ventricles.