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The word that would fit the blank is vascular. You are consuming the vascular tissues of a plant when consuming a celery stick. This part of the celery is called the petiole. This is the stalk that joins a leaf and a stem. This part is made up largely of vascular tissues.
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Major functions of the somatic nervous system include voluntary movement of the muscles and organs and reflex movements. In the process of voluntary movement, sensory neurons carry impulses to the brain and the spinal cord.