The body has a sensor that detects a deviation of the state of the cells or the body from the  point

It seems like you're asking about the body's ability to maintain homeostasis, or a stable internal environment, despite changes in external conditions. This is a complex process that involves multiple organ systems and mechanisms. Here's a step-by-step explanation:

1. Detection: The body has numerous sensors, also known as receptors, that constantly monitor conditions in the body. These include temperature receptors, pH receptors, pressure receptors, and more. These receptors are located throughout the body, including in the skin, blood vessels, organs, and brain.

2. Signal Transmission: When these receptors detect a change, or deviation, from the normal range, they send a signal to the control center of the body. This is usually the brain or the endocrine system.

3. Response: The control center then sends signals to effectors, which are muscles or glands that can change the condition in question. For example, if the body is too cold, the brain will send signals to muscles to shiver and to blood vessels to constrict, both of which help to raise body temperature.

4. Return to Homeostasis: Once the effectors have done their job and the deviation has been corrected, the receptors will detect this and stop sending signals to the control center. This allows the body to return to homeostasis.

This process is a form of negative feedback, as the body is constantly working to correct any deviations from the norm and maintain a stable internal environment.