The next heartbeat starts a new cycle of systemic circulation. Oxygen-rich blood travels through the pulmonary veins and the left atrium into the left ventricle. When we breathe out, carbon dioxide leaves our body. This is where carbon dioxide is released from the blood into the air inside the pulmonary vesicles, and fresh oxygen enters the bloodstream. The capillaries form a fine network around the pulmonary vesicles (grape-like air sacs at the end of the airways). This is where pulmonary circulation begins: The right ventricle pumps low-oxygen blood into the pulmonary artery, which branches off into smaller and smaller arteries and capillaries.
The blood, which is now low in oxygen, is collected in veins and travels to the right atrium and into the right ventricle. There the blood drops off oxygen, nutrients and other important substances and picks up carbon dioxide and waste products. The blood travels from the main artery to larger and smaller arteries and into the capillary network.
In the systemic circulation, the left ventricle pumps oxygen-rich blood into the main artery (aorta).
The following phase is called the ejection period, which is when both ventricles pump the blood into the large arteries. Blood circulation starts when the heart relaxes between two heartbeats: The blood flows from both atria (the upper two chambers of the heart) into the ventricles (the lower two chambers), which then expand. Printed OR Virtual Game to review the heart Created by The Purposeful Pedagogy I made this game for my students to review the heart structures as well as the blood flow through the heart and it has quickly become a favorite.
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