Heart Circulation
20 Aug 2010
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Heart Circulation
Heart and Circulation
The cardiovascular system which is an elaborate network in body performs two important tasks:
· It delivers oxygen and nutrients to body organs
· It removes waste products of metabolism from tissue cells.
Major components of the cardiovascular system are:
The heart- It is a hollow muscular pump.
Circulatory System- It is a system of large and small elastic vessels; it transports or conveys blood throughout the body. In one day, blood pumped through the heart of a normal healthy adult at rest reaches around 2,100 gallons.
Heart is the central organism of the cardiovascular system; it is located between the two lungs in the middle of the chest. Two-third part of the heart lies in the left of the breastbone and remaining one third in the right. Putting a hand on left side the chest, we can easily feel heartbeats on the left side of the rib cage because at that place, the bottom left corner part of the heart, that is somewhat tilted forward, comes nearest to the body surface. The heart of an adult is about the size of two clenched fists. Heart shape is conical and it weighs around 7 to 15 ounces, depends on the size and weight of the individual.
The human heart has four chambers:
· The right atrium and right ventricle.
· The left atrium and left ventricle.
The chamber walls are made of a special kind of muscle myocardium which contracts rhythmically under the stimulation of electrical currents. The left and right atria and the left and right ventricles are separated from each other by a muscle wall known as the septum. Blood returning from the body through the venous system enters into the heart through the right atrium, where it is collected and is then pumped to the right ventricle. Each time when the right ventricle contracts; it propels this collected blood, which is low in oxygen content, into the lungs; there it is enriched with oxygen. Pulmonary veins transfer the blood to the left atrium, which contracts and pass it to the left ventricle. The left ventricle, which is the main pumping chamber of the heart, ejects the blood.
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Prashant Jain
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