Tuesday, January 17, 2012

The Heart

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The topic I chose to do my report on is heart. The heart is an organ that pumps blood through the body. The heart is apart of the circulatory system. It distributes oxygen and nutrients to the body. It carries away carbon dioxide and other waste products. The heart is an important part of the circulatory system because it is the power supply. If the heart stops pumping blood more than a few minutes you can die.

The heart is shaped like an upside down pear. The heart is located to the left center inside the chest cavity. It is about the size of a balled up fist. The heart is made out of muscle tissue. It contracts to put through blood the whole body.

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The heart has four chambers. The upper two chambers are the right and left atria. These chambers are to receive blood. The lower two chambers are at the right and left ventricles. These chambers are powerful working chambers. A wall of tissue separates the right and left side of the heart from each other. Each side pumps blood through a different circuit of our blood vessels. The right side of the heart is accountable for pumping blood to the lungs. The left side is accountable for blood to the body.

There are four valves in the heart. They help prevent blood from going backwards. Blood flows in the direction in which the valves open. If the blood flows the opposite direction the valves will close. Two of the calves are stuck between the atria and ventricles. The right valve has three flaps of tissue. The other two valves are stuck between the ventricles and arteries. They have ½ flaps of tissue.

There are two vena cava, the pulmonary artery, the four pulmonary veins, and the aorta are major vessels. The right atrium of the upper blue vessel is the superior vena cava. It transports deoxygenated blood to the right atrium. The lower part of the blue vessels is the inferior vena cava. It makes deoxygenated blood leave fro the legs into the right atrium. In the right atrium blood passes through the right atrium where the blood leaves the heart through the pulmonary artery. The left and the right pulmonary arteries carries blood to the lungs. Pulmonary veins are four red veins that blood is drained from the lungs. The blood passes into the left ventricle and comes out through the aorta.

Muscle tissue wraps around tough tissue to form the walls of the heart’s chambers. A tough double-layered sac surrounds the heart. The inner layer of the sac rests on top of the heart’s muscle. The outer layer is close to the breastbone and helps store the heart in position. Between two layers is a water fluid that helps the layers from touching together.

The heart’s duties are much than simply pumping blood throughout life. The heart must also be able to respond to the changes the body needs for oxygen. When we sleep the heart works differently.

The right and left halves of the heart are separate. Even though the both bond in unison, producing a single heartbeat. An implement known as a stethoscope is use to distinguish internal body sounds. It includes the sounds produced by the heart as it beats. Valves in the heart make the heartbeat sounds. The first heart sound is longer and lower than the second.

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