Guyton’s physiological principles

Guyton’s physiological principles describe how the cardiovascular system maintains steady blood flow and blood pressure. The heart pumps blood, while blood vessels control resistance and volume. The body regulates blood pressure through mechanisms like the nervous system, which adjusts heart rate and vessel constriction, and the kidneys, which balance fluid levels. When blood pressure drops, these systems work together to increase pressure by constricting vessels or retaining fluid. These interactions show the body's ability to adapt quickly and keep vital organs supplied with blood, ensuring stable circulation despite changing conditions.