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When you want to lift your arm or take a step, your brain sends nerve signals to the appropriate muscles. Internal organs like the heart and bladder are also controlled by nerve signals, but you do not have the same kind of conscious control over them as you do over your arms and legs. The nerves that control your internal organs are called autonomic nerves, and they signal your body to digest food and circulate blood without your having to think about it. Your body's response to sexual stimuli is also involuntary, governed by autonomic nerve signals that increase blood flow to the genitals and cause