Digestion

Digestion starts in the mouth with the chewing of the viands. The solid food is mixed with expression which moistens the food and salivary amylase which partially digests polysaccharides or the starches. The food at this point is called a bolus which is hence swallowed and enters the esophagus. The esophagus is a stringy tube that reaches from the mouth to the endure. The upper esophageal sphincter opens and food enters the esophagus and moves toward the stomach by muscle contractions called peristaltic waves. Food then moves to the stomach when the lower esophageal sphincter opens. The stomach consists of triplet parts the upper portion known as the fundus, the nitty-gritty area known as the body of the stomach, and the end nighest the splendid intestine called the pylorus. Food enters the fundus and moves to the body of the stomach where the muscles in the stomach walls knead and tear it and mix it with gastric juices and with the inherent divisor necessary for th e absorption of vitamin B12. The food then becomes a semi-liquid stool called chyme. When the chyme enters the pylorus it secretes hydrochloric acid that dissolves food particles and protein-digesting enzymes, called pepsin. Absorption is the passage of nutrients into the blood. To be absorbed, nutrients mustiness be in their simplest forms.

Carbohydrates must be dispirited great deal to the simple sugars glucose, fructose, and galactose. Proteins are broken sight to amino acids and fats to fatty acids and glycerol. Most absorption occurs in the depressed intestine. Chyme moves through the pyloric sp hincter in the small(a) intestine. The smal! l intestine consists of ternary sections, the duodenum, the jejunum, and the ileum. When food enters the small intestine the ductless gland secretin causes the pancreas to release atomic number 11 bicarbonate to annul the acidity of the chyme. The gallbladder is triggered by the hormone cholecystokinin (CCK), which is produced by enteric mucosal glands when fat enters, to release bile. gall is secreted from the...If you want to contain a full essay, order it on our website: OrderCustomPaper.com

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