Anatomy- The heart - April 26,2010 The Heart The...

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April 26,2010 The Heart The Circulatory System Anatomy and Physiology Maureen Gaubatz
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In Anatomy and Physiology, the route taken by blood through the arteries, capillaries, and veins and back to the heart. “In humans, the heart is made up of four chambers: the right and left atria, and the right and left ventricles(Thibodeau&Patton,2008)”. In the right side of the heart pumps oxygen-poor blood from the cells of the body back to the lungs for new oxygen; the left side of the heart receives blood rich in oxygen from the lungs and pumps it through the arteries to the different parts of the body. “Circulation begins early in fetal life. It is expected that a given portion of the blood completes its course of circulation in exactly thirty The heart is one of the most important organs in the entire human body. It is really nothing more than a pump, composed of muscle which pumps blood throughout the body, beating exactly seventy-two times per minute of our lives. The heart pumps the blood, which carries all the vital materials which help our bodies function and removes the waste products that we do not need. For instance, the brain requires oxygen and glucose, if not received continuously, will cause it to lose consciousness. “Muscles need oxygen, glucose and amino acids, as well as the proper ratio of sodium, calcium and potassium salts in order to contract normally. The glands need sufficient supplies of raw materials from which to manufacture the specific secretions. If the heart ever ceases to pump blood the body begins to shut down and after a very short period of time will die.(Grey’s Anatomy, 2008)” The heart is basically a muscle, like any other muscle in the human body, it contracts and expands. Unlike skeletal muscles, the heart works on the "All -or-Nothing Law (Thibodeau&Patton)". That is, each time the heart contracts it does so with all its
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force. In skeletal muscles, the principle of "gradation" is present. “The pumping of the heart is called the cardiac cycle, which occurs about seventy-two times per minute. This means that each cycle lasts about eight-tenths of a second. During this cycle the entire heart actually rests “The heart is a hollow muscular organ. It acts as the “prime mover(Thibodeau&Patton)” for the circulation of the blood and the maintenance of the blood pressure”. A certain volume of blood is delivered with each beat, and an additional key aspect is the pressure at which this flow is delivered. Vital functions such as those of lung and
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This note was uploaded on 07/13/2011 for the course HEALTH CAR 101 taught by Professor All during the Spring '11 term at Kaplan University.

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Anatomy- The heart - April 26,2010 The Heart The...

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