AS Biology unit 1 Diagram of the heart and its function explained

AS Biology unit 1 Diagram of the heart and its function explained

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Form of the Heart
The four main chambres of the heart are therefore the:
Right Atrium (Labelled "RA" in the diagrams on this page);
Right Ventricle (Labelled "RV" in the diagrams on this page);
Left Atrium (Labelled "LA" in the diagrams on this page);
Left Ventricle (Labelled "LV" in the diagrams on this page)
Deoxygenated blood (from the body) is pumped through the right atrium and the right ventricle (to the lungs),
while oxygenated blood (from the lungs) is pumped through the left atrium and the left ventricle (to the
body).
Deoxygenated blood enters the right atrium from the Superior vena cava and the Inferior vena cava.
Deoxygenated blood leaves the right ventricle by Pulmonary artery, which takes blood to the lungs via the
right and left brances of the pulmonary artery.
Oxygenated blood enters the left atrium from the Pulmonary veins. These may be labelled as "right
pulmonary veins" and "left pulmonary veins".
Oxygenated blood leaves the left ventricle by Ascending aorta, which takes blood to the body via its system
of arteries, arterioles, and capillaries. Major arteries leading from the heart (via the ascending aorta) include
the brachiocephalic artery, the left common carotid artery, and the left subclavian artery (illustrated above).
These are just a few of the main arteries of the body.
It is essential that blood flows in the correct direction through the heart so the structure of the heart
includes a series of valves.
The Tricuspid valve separates the right atrium from the right ventricle. The Pulmonic / Pulmonary valve
separates the right ventricle from the pulmonary artery.

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The Mitral (also known as the Bicuspid) valve separates the left atrium from the left ventricle.…read more

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