Final answer:
During a 5 km race on a warm day, a student's body maintains homeostasis through increased blood circulation to the skin and sweating, which dissipate heat and cool the body.
Step-by-step explanation:
When a student runs a 5 km race on a warm day, her body will maintain homeostasis primarily through thermoregulation. This process involves a negative feedback loop where the core body temperature triggers homeostatic mechanisms, such as increased transport of blood from the core to the skin's surface. With blood vessels dilating, more heat is dissipated to the environment, and the cooler blood returns to the core. Alongside this, the body will also produce sweat. As sweat evaporates from the skin surface, it carries away heat, thus aiding in cooling. These mechanisms together ensure that the body does not overheat and maintains a stable internal environment even during strenuous physical activity.