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Then they close, so the blood cannot flow backwards into the atria.With this system, blood always flows in only one direction inside the heart.From here the blood begins its journey through the pulmonary cycle.
When the ventricle contracts, the blood is pushed into the pulmonary artery that branches into two main parts: one going to the left lung, one to the right lung.
The fresh, oxygen-rich blood returns to the left atrium of the heart through the pulmonary veins.
Another wall separates the rounded top part of the heart from the cone-shaped bottom part.
You can feel the thumps if you press there with your hand. If you looked inside your heart, you would see that a wall of muscle divides it down the middle, into a left half and a right half. The septum is solid so that blood cannot flow back and forth between the left and right halves of the heart.
In the pulmonary loop, the blood circulates to and from the lungs, to release the carbon dioxide and pick up new oxygen.
The systemic cycle is controlled by the left side of the heart, the pulmonary cycle by the right side of the heart.
The blood does not spill all over the place when it leaves the heart. But the arteries soon branch again and again to form smaller and smaller tubes.
Instead, it flows smoothly in tubes called blood vessels. The smallest blood vessels, called capillaries, form a fine network of tiny vessels throughout the body.
The Circulation of Blood * picture of the heart and its parts * picture of the body and some of its organs The center of the circulatory system is the heart, which is the main pumping mechanism. The heart is shaped something like a cone, with a pointed bottom and a round top. An adults heart is about the size of a large orange and weighs a little less than a pound. The heart is tipped somewhat so that there is a little more of it on the left side than on the right.
It is held in place by the blood vessels that carry the blood to and from its chambers.