Here's a breakdown:
* Stimulus: A change in the environment that triggers a response. This could be anything from light or temperature changes to chemical signals.
* Effector cells: These are the cells that actually carry out the response to the stimulus. They can be muscle cells (contracting to move), gland cells (secreting hormones or other substances), or even other types of cells that change their function in response to a signal.
Example:
* Stimulus: You touch a hot stove.
* Effector cells: Sensory neurons in your skin detect the heat and send a signal to your brain. Your brain then sends a signal back to your muscles, which contract to pull your hand away.
Key takeaway: Effector cells are the "doers" in response to a stimulus. They are the ones that carry out the action that ultimately helps the organism adapt to the change in its environment.
