Labels:hakham OCR: REFLEX ACTIONS RGANISMS need to respond instantly to certain situations without having to think. This quick, automatic response to stimulus is called : reflex action reflex action the stimulus always causes the same short -lived response For example, if an animal steps on something sharp, messages from the pain receptors its foot travel to its spinal cord (the cluster of nervous tissue in a vertebrate' back) and go out again quickly to the muscles in the leg. These muscles almost instantly pull the foot away from the sharp object. Other reflex actions include the retreat of worm into the earth bird tries to peck and blinking to protect the yes when an object comes neat the face. Reflex actions are essen tial for survival. verte brate eyes
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