Circulatory System- The Heart

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(Double) Circulatory System
It carries food and oxygen to every cell on the body, and it carries waste products to where they can be removed from the body. It is made up of the heart, blood vessels and blood. Humans have a double circulatory system-two circuits joined together.
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First Circuit
The right ventricle pumps deoxygenated blood to the lungs to take in oxygen. The blood then returns to the heart.
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Second Circuit
The left ventricle pumps oxygenated blood around all the other organs of the body. The blood gives up its oxygen at the body cells and the deoxygenated blood returns to the heart to be pumped out to the lungs again.
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The Heart
It is a pumping organ that keeps the blood flowing around the body. The walls of the heart are mostly made of muscle tissue. The heart has valves to make sure that blood flows in the right direction- they prevent it flowing backwards.
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How Blood is Pumped Around
Blood flows into the two atria from the vena cava and the pulmonary vein. The atria contract, pushing the blood into the ventricles, which then contract, forcing the blood into the pulmonary artery and the aorta, and out of the heart.
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How Blood is Pumped Around (Continued)
The blood then flows to the organs through arteries, and returns through veins. The atria fill again and the whole cycle starts over.
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Coronary Arteries
The heart also needs its own supply of oxygenated blood. Arteries called coronary arteries branch off the aorta and surround the heart, making sure that it gets all the oxygenated blood it needs.
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The Heart's Pacemaker
Your resting heart rate is controlled by a group of cells in the right atrium wall that act as a pacemaker. They produce a small electric impulse which spreads to the muscle cells, causing them to contract.
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Artificial Pacemaker
One is often used to control heartbeat if the natural pacemaker cells don't work properly. It is a device which is implanted under the skin and has a wire going to the heart. It produces an electric current to keep the heart beating regularly.
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Other cards in this set

Card 2

Front

The right ventricle pumps deoxygenated blood to the lungs to take in oxygen. The blood then returns to the heart.

Back

First Circuit

Card 3

Front

The left ventricle pumps oxygenated blood around all the other organs of the body. The blood gives up its oxygen at the body cells and the deoxygenated blood returns to the heart to be pumped out to the lungs again.

Back

Preview of the back of card 3

Card 4

Front

It is a pumping organ that keeps the blood flowing around the body. The walls of the heart are mostly made of muscle tissue. The heart has valves to make sure that blood flows in the right direction- they prevent it flowing backwards.

Back

Preview of the back of card 4

Card 5

Front

Blood flows into the two atria from the vena cava and the pulmonary vein. The atria contract, pushing the blood into the ventricles, which then contract, forcing the blood into the pulmonary artery and the aorta, and out of the heart.

Back

Preview of the back of card 5
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