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The digestion processes

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The primary functions of the digestive system are the breakdown of food called digestion and absorption of nutrients Digestion begins in the mouth where the teeth break food into smaller particles during mastication salivary glands, located near the oral cavity secrete saliva which begins chemical digestion and keeps the food moist As food is swallowed the soft palate blocks the upper pharynx to prevent food for entering the nasal cavity and multiple voluntary muscles in the face, neck and tongue contract pussing food particles through the pharynx The food passes over the epiglottis which prevents food entering into the respiratory system and then into the esophagus which connects the pharynx to the stomach The one way movement of the food mass, now called the bolus is controlled by wave like involuntary muscle contractions This movement is known as peristalsis The bolus now enters the stomach Folds in the stomach wall, called rugae allow for expansions in the stomach fields Stomach cells secrete hydrochloric acid, pepsinogene and various regulatory hormones that chemicallly digest the bolus Muscular contractions in the stomach turn its contents to further breakdown the bolus and mixed it with stomach secretions to form a thick liquid called quime Quime exits the stomach trough pyloryc sphincter and enters the small intestine, the major site of nutrients absorption The small intestine consists of three parts the duodenum, jejunum and ileum Bile from the liver and digestive enzymes from the pancreas enter into the duodenum to end the digestion absorbed nutrients pass from the lumen of the small intestine into blood and lymph Chyme not absorbed in the small intestine enters the large intestine as it passes through the cecum and ascending, transverse, descending and sigmoid colon water and salts are absorbed and chyme is converted into faeces The rectum stores faeces until nervous stimulation initiates the defecation reflex resulting in elimination through the anal canal

Video Details

Duration: 2 minutes and 33 seconds
Country: Spain
Language: English
License: Dotsub - Standard License
Views: 124
Posted by: mjosferreiro on Jan 7, 2016

It shows us how digestion takes place

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