What is an involuntary action?, X-ray, Reflex, Organ, Joint, Which body system includes the brain, spinal cord, and nerves?, Nervous system, Muscular system, Digestive system, Skeletal system, What are nerves made of?, Enzymes, Muscles, Neurons, Bones, What do neurons receive from the world around us?, Waste, Blood, Information, Bones, Where do messages travel before reaching the brain?, Mouth, Spinal cord, Stomach, Rectum, Which organ sends return messages?, Ribcage, Esophagus, Mouth, Brain, Who reacts to the brain's message?, Muscles organs, X-rays, Cell walls, Chloroplasts, What receives stimuli from the world?, Sense organs, Rectum, Chloroplasts, Ribcage

Nervous System

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