Heart
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what does it look like?
- the heart, which is usually as big as a
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, looks like a big blood vessel (vein or artery) and it has very thick walls (
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)
- it is situated in the middle of the chest cavity (
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), a little bit on the left, and it weighs around
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grams
- it is surrounded by a fluid filled sac called the
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- it is divided by a partition or septum into two
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, and the halves are in turn divided into four
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:
- the 2 upper chambers are called
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- two lower chambers are called
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- the chambers are divided by the
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in a right and a left side, each with its own specific function
- in the right side atrium and ventricle are connected by the
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valve and in the left side they are connected by the
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valve
how does it work?
- the heart works as a
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for liquids and, contracting and relaxing thanks to electrical impulses, it helps supplying blood and oxygen to all parts of the body
Systole Phase: the ventricles contract and pump blood to the
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Diastole Phase: the heart ventricles are relaxed and the heart fills with
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what' s its function
- it transports the most important elements for the life of cells (blood and
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) throughout the whole body
- the blood provides oxygen and it also gathers the metabolic
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of cells and takes it to the organs which eliminate it
which organs is it linked to?
- it is directly connected to all the big blood vessels, and to the
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through the vena
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and the pulmonary
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