Chapter 6 KO.docx - Chapter 6- The human Body 5. Discuss...

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Chapter 6- The human Body5. Discuss the anatomy and the physiology of the circulatory system. (pp 196-208)The circulatory system is made up of connected tubes, including the arteries, arterioles, capillaries,venules, and Veins. This system is also known as the cardiovascular (heart/ blood vessels) system. Theheart has a septum (wall) that divides into a left and right side, each of those sides are divided again intoan upper chamber (atrium) and a bottom chamber (ventricle). The two circuits in the body are, thesystemic circulation that carries oxygen-rich bloodfrom the left ventricle through the body and back tothe right atrium. The Pulmonary circulation in the lungs carries oxygen-poor bloodfrom the rightventricle through the lungs and back to the left atrium. The normal adult resting heart rate (HR) canrange from 60 to 100 beats per minute (BPM). During physical activity the heart rate can raise to 180BPM. The amount of blood that is moved by one beat is known as the stroke volume (SV), at each beat70 to 80 mL of blood is ejected from the heart. Cardiac output is the amount of blood moved in oneminute. In one minute, the blood volume of 5 to 6 L is circulated through all the blood vessels in adults.Children have less 2 to 3 L depending on age and size. The heart beating is known as the heartcontractions produced by the pumping action of the heart. There are 2 electrical processes. The first isdepolarization, this is the electrical charges on the surface of the muscle cell changing from positive tonegative. The second is repolarization, this is the heart returning to its resting state and positive charging

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