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Chapter_4_Cardiac_An - Chapter 4 Anatomy of the Human Heart BME 501 Lungs Heart Diagphragm Human Anatomy Model aorta Pulmonary artery Goals To

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Chapter 4 Anatomy of the Human Heart BME 501
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Heart Lungs Diagphragm
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Human Anatomy
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Model aorta Pulmonary artery
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Goals: To identify key anatomic structures and function
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Section of Human Heart: From Anatomy to Function
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Human Heart Anatomy
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"It is absolutely necessary to conclude that the blood in the animal body is impelled in a circle, and is in a state of ceaseless motion; that this is the act or function which the heart performs by means of its pulse." William Harvey's description of the circulation of the blood and the motive force of the heart in de Motu Cordis (1628) is considered the beginning of modern physiology. In the adult human body, the heart beats about 70 times per minute, or approximately 100,000 beats per day. During exercise or intense emotion the human heart rate can increase to 200 beats per minute. Thus, in a life span of seventy-five years, with everyday stresses and emotions, a human heart may beat more than 3 billion times. The heart pumps approximately 100 milliliters per beat. In seventy-five years, this amounts to 300 million liters of blood. The pumping action of the heart and the changes in its activity in response to body needs are necessary for life, so much so that up to one-third of all deaths in the United States result from heart disease. In humans and other mammals, the heart consists of two pumps. The right side of the heart pumps blood to the lungs, where the blood is oxygenated and then returns to the heart. This circuit is called the pulmonary circulation. The left side of the heart receives oxygenated blood from the lungs and pumps it to the rest of the body. Then, as was first
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This note was uploaded on 02/27/2008 for the course BME 501 taught by Professor Yamashiro,hsiai during the Fall '07 term at USC.

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Chapter_4_Cardiac_An - Chapter 4 Anatomy of the Human Heart BME 501 Lungs Heart Diagphragm Human Anatomy Model aorta Pulmonary artery Goals To

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