How the heart works

About Heart 

• Parts of the heart
• Did you know?
• The average weight of a healthy female human heart is 9oz (255g).
• A man's heart is usually slightly bigger at around 10.5oz (300g).
• Every heart is made up of three layers:
• an inner lining called the endocardium
• a middle layer of muscle called the myocardium
• an outer fluid-filled sac known as the pericardium.
• The heart is divided into four chambers:
• the right atrium and left atrium are the upper chambers of the heart
• the right ventricle and left ventricle are the lower chambers.
• A muscular wall called the septum separates the right and left sides of the heart.
• Each of the chambers has valves. The valves have different names:
• the tricuspid valve is at the exit of the right atrium
• the mitral valve is for the left atrium
• the pulmonary valve is at the exit of the right ventricle
• the aortic valve is at the exit of the left ventricle.
• Their purpose is to allow blood to move forwards through the heart and to prevent it flowing backwards into the previous chamber.

www.worldhealthinfo.net

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