Although the microvasculature uses local control mechanisms to adjust vascular resistance based on the physical and chemical environment of the tissue and vasculature, the dominant regulatory system is the sympathetic nervous system. As Chapter 18 explains, the arterial pressure is monitored moment-to-moment by the baroreceptor system, and the brain adjusts the cardiac output and systemic vascular resistance as needed via the sympathetic and parasympa-thetic nervous systems. Sympathetic nerves communicate with the resistance vessels and venous system through the
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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.