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Amy runs hard during a race. Carbon dioxide levels in her bloodstream rise, becoming higher than normal. Any change in an organism's environment that causes the organism to react.
In physiology, a stimulus is a detectable change in the physical or chemical structure of an organism's internal or external environment. The ability of an organism or organ to detect external stimuli, so that an appropriate reaction can be made, is called excitability sensitivity.He is hungry, so he eats something. A rabbit is scared and runs away. You're cold so you put on a jacket. External stimuli include touch and pain, vision, smell, taste, sound, and balance balance. These sensory stimuli are activated by external changes. Pain is the stimulus that can provoke a greater response from the organism. Homeostasis is the body's ability to maintain a stable internal environment despite a changing external environment. Homeostasis is maintained primarily through negative feedback, when a response to a stimulus keeps a variable close to a set value.
To learn more about Homeostasish please click on below link.
https://brainly.com/question/3888340.
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