Survival is the human body’s most important business. Survival depends on the body’s maintaining or restoring homeostasis, a narrow set of stable internal conditions through a system of feedback and communication mechanisms among multiple organ systems. In this course, students plan and conduct investigations related to how body systems interact to effectively monitor and respond to internal and external environmental changes. Students develop and use models to illustrate processes that occur in the human body in order to maintain homeostasis, including gas exchange, glucose regulation, thermoregulation, and maintaining water balance.