Heart
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what does it look like?
- the heart, which is usually as big as a 1, looks like a big blood vessel (vein or artery) and it has very thick walls (2)
- it is situated in the middle of the chest cavity (3), a little bit on the left, and it weighs around 4 grams
- it is surrounded by a fluid filled sac called the 5
- it is divided by a partition or septum into two 6, and the halves are in turn divided into four 7:
- the 2 upper chambers are called 8
- two lower chambers are called 9
- the chambers are divided by the 10 in a right and a left side, each with its own specific function
- in the right side atrium and ventricle are connected by the 11 valve and in the left side they are connected by the 12 valve
how does it work?
- the heart works as a 13 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 14
Diastole Phase: the heart ventricles are relaxed and the heart fills with 15
what' s its function
- it transports the most important elements for the life of cells (blood and 16) throughout the whole body
- the blood provides oxygen and it also gathers the metabolic 17 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 18 through the vena 19 and the pulmonary 20
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