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Heart and Heart Disease Summary

The heart has two sides, left and right, which both comprise of an atrium and ventricle. The
left side pumps to the whole body, therefore is larger. The right side pumps to the lungs,
therefore is smaller.

There are four blood vessels connected to the…

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Changes in blood pressure cause the opening and closing of valves (AV, semi-lunar and
pocket). For example, in ventricular systole, the AV valves are closed, as blood pressure is
higher in the ventricles than atria.

The heart is myogenic, and the cardiac cycle is controlled by electrical impulses within the…

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The weakened section then swells, causing a balloon shape. This area often bursts, causing a
haemorrage. Blood can no longer reach the area.

When aneurysms occur in the brain, it is called a cerebrovascular accident (CVA), or a stroke.

The main factors that increase the risk of heart disease are:…


Charlotte Evans


Amazing! Clear, unstandable and concise. 

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