Rhythm

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Our bodies feature many rhythms. They help and control us, from the day we are born until the day when we die. The electrical activity produced by our brains, the electrical activity of our heart, and our breathing cycles are just a few examples of our rhythms. The need for food and rest varies predictably. Even hormone levels follow a cyclic schedule.

Social rhythms are also important. To many people, it is a disaster to miss the annual Christmas celebration or a family member’s birthday—this despite the fact that there will probably be many more celebrations and birthdays.

Many of our basic rhythms are controlled by the brain stem. We ...

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