What is a stimulus? What is homeostasis? How are irritability and homeostasis related? Describe an example of homeostasis, response and adaptation in a living organism.

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stimulus is a thing or event that evokes a specific functional reaction in an organ or tissue.

homeostasis is the tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.

Irritability is that characteristic of living organisms in being aware of, and being able to respond to, a stimulus which tends to disturb the steady state or homeostasis which all organisms prefer for maintaining life.

Humans' internal body temperature is a great example of homeostasis. When someone is healthy, their body maintains a temperature close to 98.6 degrees Fahrenheit (37 degrees Celsius). Being warm-blooded creatures, humans can increase or decrease temperature internally to keep it at a desirable level.

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