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- Responsiveness is the ability of the body to detect and respond to changes.
- Changes in the internal environment are called internal stimuli.
- An increase in body temperature during a fever is an example of an internal change.
- Changes in the external environment are called external stimuli.
- Turning the head toward a sound is a response to an external stimulus.
- Responsiveness helps prepare the body for potential threats.
- Different types of cells respond to environmental changes in specific ways.
- Nerve cells respond by generating electrical signals called nerve impulses (action potentials).
- Nerve impulses (action potentials) are electrical signals used for communication in the body.
- Muscle cells respond by contracting.
- Muscle cell contraction generates force to move body parts.
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