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Part 2 book “Seeley’s essentials of anatomy physiology” has contents: Blood vessels and circulation, lymphatic system and immunity, respiratory system, digestive system, nutrition, metabolism, and body temperature regulation, urinary system and fluid balance, reproductive system, development, heredity, and aging. | 13 C h A P t e r Blood Vessels and Circulation leArn tO PrediCt t. J. and tyler were building a treehouse. While searching for a board in a pile of lumber, t. J. stepped on a rusty nail that penetrated deep into his foot, causing it to bleed. neither t. J. nor tyler wanted to tell their parents about the accident, but after three days, t. J.’s foot became infected and the infection spread into his bloodstream. the infection quickly became much worse and t. J. went into septic shock. After reading this chapter and recalling information about the structure and function of the heart described in chapter 12, explain how t. J.’s blood volume, blood pressure, heart rate, and stroke volume changed due to septic shock. Also, explain how blood flow in the periphery changed and how it affected t. J.’s appearance. Finally, explain the consequences if t. J.’s blood pressure remained abnormally low for a prolonged period of time. 13.1 FunCtions oF the CirCulAtory system Learning Outcome After reading this section, you should be able to A. list the functions of the circulatory system. The blood vessels of the body form a network more complex than an interstate highway system. The blood vessels carry blood to within two or three cell diameters of nearly all the trillions of cells that make up the body. Blood flow through them is regulated, so that cells receive adequate nutrients and so that waste products are removed. Blood vessels remain functional, in most cases, in excess of 70 years, and when they are damaged, they repair themselves. Blood vessels outside the heart are divided into two classes: (1) the pulmonary vessels, which transport blood from the right ventricle of the heart through the lungs and back to the left atrium, and (2) the systemic vessels, which transport blood through all parts of the body, from the left ventricle of the heart and back to the right atrium (see chapter 12 and figure 12.2). Together, the pulmonary vessels and the systemic vessels .
