Example: Hitting just below the knee on the tendon.
Action: the leg kicks out slightly.
Receptor: Nerves and tendon in the knee.
Effector: Quadriceps react.
Another example would be a pupil changing size when the surroundings change from light to dark, or dark to light. The muscle in the eye is reacted when this change happens and adjusts the pupil to focus. The reaction can help survival by adjusting to the dark; for humans its useful to be able to see in the dark so we can see where we're going; for animals it helps them hunt and find shelter.
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