The Heart Essay

943 words - 4 pages

The hearts job is to pump blood to the lungs and then all around the body. The right side of the heart takes blood from the body from the body and pumps it to the lungs. The left side of the heart takes blood filled with oxygen from the lungs and pumps it to the rest of the body. Valves inside the heart stop blood flow the wrong way. The heart is made of a special kind of muscle, called cardiac heart muscle, which never gets tired. The heart is about the same size of the person closed fist. It lies nearly in the middle of your chest and the lower end tilts towards the left side of the body.
An average man has about 11 to 13 pints of blood; and an average woman has between 9 to 11 pints. Blood travels around the body through tubes called arteries and veins. These branch off into smaller tubes that reach every cell of the body. Blood goes around the body about once a minute or 1,500 times a day. Each tiny drop of blood contains up to 5 million red blood cells that give blood its red color. Red blood cells contain hemoglobin, which takes in oxygen in the lungs. Blood that has a lot of oxygen is bright red.
Electrical impulses cause your heart to beat. These impulses are made by special areas of tissues in the heart called nodes. The nodes are filled with nerves, and send out signals that help the heart muscle cells contract.
The heart contains four chambers; a right and left atrium and a right and left ventricle. The septum that separates the left and right side of the heart. There are several types of vessels that are connected to the heart the first is the pulmonary trunk; which exports “used” blood to go to the left pulmonary artery. Next is the aorta, which is the largest blood vessel that supplies blood to the heart muscle. After comes the venae cavae, which is split into to vein, one being the superior vena cava and the inferior vena cava. The superior vena cava is a large vein that channels oxygen poor blood from the upper part of the body. The inferior vena cava transports “used” blood from the lower body to later return to the heart. Both of these venae cavae are located empty into the right ventricle. The last vessels connected to the heart is the pulmonary veins, which blood stocked with oxygen comes to the heart from the left lung.
There are five valves of the heart. The first valve is the right atrioventricular valve or other wise know as the tricuspid valve which is located between the right atrium and right ventricle. The AV valves also create the hearts sound pattern, which comes from the friction of the blood against the closed valves. The sound that is...

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