Blood circulation Heart circulatory system.
The circulatory system consisting of the heart, arteries, capillaries, and veins, is the pumping mechanism that transports blood throughout the body.
In the heart, the left ventricle contracts, pushing red blood cells into the aorta, the body’s largest artery.
From here, blood moves through a series of increasingly smaller arteries, until it reaches a capillary, the junction between arteries and veins.
Here oxygen molecules detach from the red blood cells and slip across the capillary wall into body tissue.
Now de-oxygenated, blood begins its return to the heart.
It passes through increasingly larger veins to eventually reach the right atrium.
It enters the right ventricle, which pumps it through the pulmonary arteries into the lungs, to pick up more oxygen.
Oxygenated, blood reenters the left atrium, moves into the left ventricle, and the blood’s journey begins again.
How the Body Works : Inside the Heart
The heart is a muscular pumping organ which beats nonstop to circulate blood around the body. It functions as two halves, each consisting of a holding chamber, or atrium, and a pumping center, or ventricle.
After circulating around the body, blood, now deoxygenated, returns to the right atrium through large veins, the superior vena cava and the inferior vena cava. When the atrium is full, blood is forced through the tricuspid valve into the right ventricle. It is then pumped to the lungs through the pulmonary valve into the pulmonary artery.
The oxygenated blood returns via the pulmonary veins to the left atrium. After flowing through the mitral valve it is pumped out of the left ventricle into the aorta to return to the general circulation.
The Circulatory Song!
A song to help you to learn about the circulatory system.
Pump Your Blood Song and Lyrics
A more detailed song to help you to learn about the circulatory system.
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