A reflex is an involuntary action that your body does in response to something. Our brain controls involuntary actions, which means we don’t have to think to make them happen. For example, if you touch something ____, your brain makes you ____ your hand away fast. The part of the brain that controls this is called the medulla. Other involuntary actions include ____ when we are tired or ____ when we have a cold or an allergy to something. It also controls our ____. A doctor can check the ____ in your knee by ____ them gently with a small hammer. The reflexes in your knees are important for keeping your balance

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