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An anus is the opening of the rectum, colloquially known as the a**hole. Sphincter muscles make sure that it is closed unless it is time to defecate. Two sphincters – an internal and external control that process. The muscles of the internal sphincter are involuntary; however a person can control the muscles of the external sphincter.

Epidermis is the outermost layer of the skin. On the top it mostly consists of scale-like cells that are called squamous cells. The round cells right under the squamous cells are known as the basal cells. And under the basal cells are melanocytes – these cells produce melanin that gives skin its color.

Esophagus, or gullet is a muscle-lined tube that extends from the mouth to the stomach. Food passes through the esophagus to the stomach by a process known as peristalsis – a wave-like series of involuntary muscular contractions that move the food down. The junction between the esophagus and the stomach is called a cardia or the Lower Esophagus Sphincter (LES). That is where the stomach (gastric) acid sometimes gets pushed into the esophagus, often resulting in heartburn.

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Random Useful Tip:
Epinephrine shot
If you are known to have a severe anaphylactic reaction, carry an epinephrine (adrenaline) shot with you at all times. Pay attention to expiration date and replace it regularly: upon expiration, it loses its effectiveness.

Random Drug Info:
Acyclovir is a medication that is used to treat herpes infections of the skin, lips and genitals, chicken pox and shingles. It comes in the form of ointments, tablets, capsules or liquids. It relieves pain and itchiness and promotes healing; however, it does not cure the condition. Possible (but not common) side effects include headaches, upset stomach, vomiting and diarrhea. Severe side effects, such as severe rash or itching, blood in the urine, stomach pain or fever are even less common, but require prompt medical attention.

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