Human Heart Diagram
This human heart diagram shows the most powerful muscle in the human body.
It is made up of a special type of muscle called myocardium which occurs nowhere else in the body.
The heart has two sides:
- The left side takes in oxygenated blood from the lungs (via the pulmonary vein).
- The oxygenated blood enters the heart’s left atrium which contracts, pushing it through into the left ventricle, which pumps it out of the heart and around the body via the aorta (the main artery).
- The right side takes in deoxygenated blood from the body (via veins) and pumps it back to the lungs to be oxygenated again.
- The deoxygenated blood enters the heart’s right atrium which contracts, pushing it through into the right ventricle, which pumps it out of the heart and back to the lungs via the pulmonary artery.
- The left side of the heart has a much thicker walled ventricle, as this has to pump the blood around the body at high pressure.
- The high pressure in the arteries causes a pulse.
- The arteries narrow down into capillaries, which have very thin walls to enable oxygen and nutrients to seep out (in the form of tissue fluid) into the surrounding tissue.
- A strong muscular wall called the septum divides the two sides of the heart.
- Four one-way valves control blood flow through the heart chambers.
- The heart muscles have a separate network of blood vessels that supply it with oxygen, this is called the coronary system.
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