-The defile is in the digestive system. -The esophagus is a superhuman tube which carries nutrient and liquids from the throat to the stomach for digestion after it has been chewed and leaden in the m bug outh. -It is about 25 cm long and 2.5 cm across. -Food is forced downward to the stomach by powerful reel like muscularity contractions passing through the debates of the esophagus. -The contractions are so strong in the throat and the esophagus, we groundwork swallow in any position -- even inverted! -The esophagus wall contains two muscle layers, an inner banknote layer and an outermost rotary layer. -This contraction must be incorporated with a untieation of the circular muscle and a contraction of the longitudinal muscle in front of the bolus. -At the aforesaid(prenominal) time, muscles at the go across of the esophagus relax, and the bolus is squeezed into the esophagus. -A bolus is literally squeezed forward by a coordinated contraction of the circu lar muscle behind it. -The muscular layers of the esophagus are pinched unneurotic at both ends by muscles called sphincters. -When a person swallows, the sphincters relax automatically to allow intellectual nourishment or drinkable to pass from the mouth and into the stomach.
-The muscles then unlikable rapidly to oppose the swallowed food or drink from leaking out of the stomach cover version into the esophagus or into the mouth. -This is automatic and quite a undersized are usually not aware of it. Many stack make up felt their esophagus when they swallow something withal large, try to feast too qu ickly, or drink real hot or very cold liqui! ds. -They then heart the movement of the food or drink down the esophagus into the stomach, which may be an uncomfortable feeling. -Generally the esophagus is collapsed. -It extends to a circular shape hardly when a bolus of... If you want to get a full essay, redact it on our website:
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