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- Responsiveness is the ability of the body to detect and respond to changes.
- Changes can occur in the internal environment or the external environment.
- An example of an internal change is a fever, which raises body temperature.
- An example of an external response is turning the head toward squealing brakes.
- Different cells respond to changes in specific ways.
- Nerve cells respond by generating electrical signals called nerve impulses.
- Muscle cells respond by contracting to produce movement.
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