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Formed form a system of continuous tubes (blood vessels) that carry blood around the body.
Human circulatory system carries substances around the body. The table shows important substances transported around the human body.
Blockage of the coronary arteries can occur when layers of cholesterol are deposited on the inner lining of blood vessels and this causes coronary heart disease.
The tubes are connected to a pump, the heart, which forces the blood through the circulation.
Factors that increase risk of blockage:
Diet - High levels of saturated fats in diet.
Smoking - Chemicals in tobacco smoke can damage the delicate lining of arteries
Valves in the heart and in some of the blood vessels make sure that blood circulates only in one direction.
Single circulatory system
*arteries that provide blood to the heart itself
Double circulation
On average the heart rate for an adult human is between 60 and 80 bpm, but it may vary as a result of:
Measure of how frequently the heart beats per minute.
The contraction of the heart is regulated by electrical activity in nerves in the heart. The pattern of activity from a normal heart beat can be recorded as an electrocardiogram (ECG).
Age - children usually have a faster average than adults.
Fitness - A trained athlete may have a resting rate as low as 40 beats per minute.
Illness - Infection can raise resting heart rate, but some disease can slow resting heart rate.
Drugs - some drugs can change heart rate.
The 'dugeun dugeun' or 'doki doki' sounds of one complete contractions are the sounds of the valve inside the heart as they open and shut.