Pumping organ that keeps the blood flowing around the body.
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What are the walls of the heart made up of?
Muscle tissue.
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How does the heart prevent blood flowing backwards?
The heart has valves to make sure that blood flows in the right direction.
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What are the four chambers of the heart?
The right atrium, the left atrium, the right ventricle and left ventricle.
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How does the blood flow into the two atria?
From the vena cava and the pulmonary vein.
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Why does the atria contract?
To push the blood into the ventricles.
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Why do the ventricles contract,
To force the blood into the pulmonary artery, and aorta and out the heart.
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How does the blood return to the veins?
The blood flows to the organs through arteries and returns through the veins.
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What are coronary arteries?
Arteries that branch off the aorta and surround the heart making sure that it gets all the oxygenated blood it needs.
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What is the resting heart rate controlled by?
A group of cells in the right atrium wall that acts as a pacemaker.
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What does these cells produce?
A small electric impulse which spreads to the surrounding muscle cells making them contract.
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When is an artificial pacemaker used?
To control heart beat if the natural pacemaker cells don't work properly (irregular heartbeat). Its a little device that is implanted under the skin and has a wire going to he blood producing electric current to keep the heart beating regularly.
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Other cards in this set
Card 2
Front
What are the walls of the heart made up of?
Back
Muscle tissue.
Card 3
Front
How does the heart prevent blood flowing backwards?
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