Examlex
Explain why, in terms of photons, ultraviolet light can damage cells in your skin but visible light cannot.
Saliva
A watery fluid produced by the salivary glands in the mouth, essential for chewing and digestion.
Mucus
A viscous, slippery secretion produced by, and covering, mucous membranes.
Esophageal Sphincter
A ring of muscle at the end of the esophagus that closes to prevent stomach acid from coming back up, and opens to allow food to enter the stomach.
Hepatic Duct
A duct that leaves the liver carrying bile and merges with the cystic duct to form the common bile duct.
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