You are sweating, because your body is trying to cool you off, making it so you return to your set point, or ideal body temperature. You turning red also helps lower your body heat.
Negative feedback is when your body responds to conditions that change from the set point and then returns conditions to its set point.
While Meghan was running on the treadmill, she noticed that she was getting hot. The color of her skin was appearing a light shade of red and water was coming out of her skin.
Meghan decided to take a break, because she wasn't sure why she was turning red and why water was coming out of her skin. That is when Eric began to tell her that her body was demonstrating negative feedback.
Eric then goes on to tell Meghan what negative feedback is.
After Meghan realizes what her body is doing is a good thing, she returns back to the treadmill and resumes her workout.
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