The muscular system allows for movement within the body, for example, during digestion or urination. Smooth muscles in the gastrointestinal or GI tract control digestion. The GI tract stretches from the mouth to the anus. Food moves through the digestive system with a wave-like motion called peristalsis.
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A substrate fits into the active site of an enzyme like a lock and key. The substrate has a certain shape that matches or is very similar to the shape of the enzyme so it's the perfect fit, like "a lock and key."
Bacteria can be treated with antibiotics
