An understanding of the circulation depends on knowledge of the physical principles governing blood flow. But first, we will briefly describe the cardiovascular system (Fig. 12.1). Contractions of the left ventricle propel blood into the aorta, the large arteries, and the vasculature beyond. Because of their elasticity, the aorta and large arteries are distended by each injection of blood from the heart. The aorta and large arteries recoil between ventricular contractions, continuing the flow of blood to the periphery.
Several regulatory mechanisms normally keep aortic pressure within a narrow range, providing a pulsatile but
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.