Structure and function of the heart

Heart is located in the thoracic cavity between the lungs and behind the sternum, itis enclosed in a fiborous bag made from inelastic connective tissue called the pericardium.
The hearet is a muscular double pump divided into two halves, each of which contain two chambers.
The wall of the heart is made from mainly myocardium, that consists of cardiac muscle.
This contracts to make your heart beat.
Coronary arteries seen lie on the surface of the heart.
They oxygenated blood to the heart muscle.
The heart is divided into four chambers.
2 upper chambers are called the atria and they have thin walls and they sit above the two lower chambers called ventricles.
Ventricles are thicker walled chambers.
Deoxygenated blood flows into the right atrium from the vena cava; at the same time the left atriun receives oxygentated blood from the lungs via the pulmonary vein.
From here the blood flows into…

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