Urinary, Immune, and Skeletal Systems

Every living human body is an autonomous, self-sustaining metropolis. For this biological city to function, three fundamental infrastructural requirements must be met: a masterful sanitation system to filter out chemical waste while preserving precious water, an elite defense force capable of identifying and neutralizing microscopic invaders, and a dynamic, mineral-reinforced framework that simultaneously protects vital machinery and manufactures the very blood that gives the city life. In the clinical environment, a nurse encounters the failure of these systems every day. Edema in a patient's lower extremities reveals a faltering filtration plant; a sudden, spiking fever signals a biological war waged by the defense force; and a fractured hip in an elderly patient demonstrates the catastrophic loss of structural integrity. To accurately assess and treat a patient, you must intimately understand the intricate engineering of the urinary, immune, and skeletal systems.