Heart Barrel
Heart Barrel
Another great place to find Heart Barrel
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The Heart and It’s Working
1. The heart of an adult is about the size of two clenched fists.
2. In a time period of an average lifetime, the heart pumps around 1million barrels of blood, which is enough blood to fill supertankers, this only takes into an account when it work at rest. During exercise or stress time, the heart may pump ten times more as much blood as it does at rest time.
3. In the time period of one year, the human heart beats around 3 million times.
4. Even when a person is in resting condition, the heart muscles work twice as hard as the leg muscles of a person running at his top speed.
5. The total amount of energy expended by the healthy heart in around 50 years is enough to lift a battleship out of the sea.
6. The electrical signal produced through the sinus node travels over the entire surface of the heart in only 21/100 to 26/100 part of a second.
7. Completely stretched, the vessels of the circulatory system-arteries, arterioles, capillaries, venules, and veins-would measure around 60,000 miles.
8. The oxygen and nutrients transported and delivered in the bloodstream with each beat of the heart nourishes around 300 trillion cells.
9. The capillaries, which are the smallest blood vessels in our body, are so tiny that ten of them in a combination are only as thick as a human hair.
10. In totality of area, the capillary walls are equal to about 60,000 to 70,000 square feet, or roughly the area of around one and a half football fields. Because it transverse blood into the entire body, this ventricle works harder than all other chambers; as a result, its walls can be more than half inch thick or two to three times thicker than the walls of the right ventricle.
Blood in the heart is kept moving in a forward direction through a managed system of four one-way valves, each close off on one of the heart’s chambers at the right time in the cardiac cycle system. The valves open to let the blood pass through when the chambers contract, and quickly shut to prevent it from flowing backward when the chambers relax. The valve system also helps in maintaining different kind of pressures on the right and left sides of the heart. The valves differ significantly in structure. The two valves separating the ventricles from the circulatory system are known as semi lunar due to their crescent shaped cusps. Pulmonary valve lies at the right ventricle juncture and the pulmonary artery. It consists of flaps of tissue or three cusps that open freely when the right ventricle contracts and blood is transferred into the lungs, and then fall back when the ventricle relaxes. The other semi lunar valve, the aortic valve, lies between the left ventricle and the aorta and also has flaps of tissue or three cusps. When the left ventricle relaxes, the pressure in the aorta pushes the valve to be closed. The ventricles are separated from the atria by valves that, in addition to the tissue, have thin but strong cords of fibrous tissue, called chordae tendineae; these cords tether the valves to the ventricular walls. When the ventricles contract, small muscles in their walls, which are known as papillary muscles, pull the cords, which acts as a guide wires, and controls the closure of the valve leaflets, preventing them from going too far backward. The valve situated between the left ventricle and left atrium has a conical shaped funnel. It has two leaflets that are remarkably mobile and can open and close rapidly. The corresponding valve between the right ventricle and right atrium is called the tricuspid valve.
In the inner side, the heart is covered with a protective layer of cells that form a smooth membrane known as the endocardium. At the outer side, the heart is covered in a two-layered fibrous sac known as the pericardium, which extends to cover the roots of the major blood vessels. The inner layer of the pericardium is attached with the heart muscle, while the outer layer, which is connected by ligaments to the vertebral column, the diaphragm, and other body parts, holds the heart firmly at its place. The heart can freely move within the outer pericardium because of the layers which are separated by a thin film of lubricating fluid.
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Prashant Jain
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