Biologists were tracking a runner who was running outside in 68 degree weather. She was sweating 1.9 liters of water an hour and did not eat or drink anything. After 90 minutes, she collapsed and fell into a state of hypothermia -- the condition your body goes into when your internal temperature decreases well below 98.6 degrees F. The biologists analyzed the data to see why the runner collapsed. Below are three possible conclusions.

Conclusion #1: The runner was in a constant state of homeostasis. All their internal body systems were in balance including her internal temperature, her circulatory system, her digestive system, and her nervous system.

Conclusion #2: The runner was in a constant state of homeostasis. Their internal body systems were NOT in balance including her internal temperature, her circulatory, her digestive, and her nervous system.

Conclusion #3: The runner was NOT in a constant state of homeostasis. Their internal body systems were NOT in balance including her internal temperature, her circulatory, her digestive, and her nervous system.

Directions: Choose the conclusion you think is correct from the options above and write a CER to fully explain your answer. Use the word bank below and everything you know about homeostasis and the body system to explain your answers.

Word Bank: homeostasis, circulatory system, digestive system, respiratory system, carbohydrates, water, carbohydrates, ATP, cellular respiration, urinary system, nutrients.