the first part of the small intestine is called the duodenum. the duodenum is only 25 cm long, but...
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The first part of the small intestine is called the duodenum. The duodenum is only 25 cm long, but most of the digestion takes place in this region.
Small intestines
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Small intestinesSmall amounts of chyme are ejected approximately every 20 seconds from the stomach into the duodenum. #digestion
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Small intestines
#digestion #juices
Also opening into the duodenum are ducts from the pancreas and the gall bladder. These allow enzyme-rich pancreatic juice and bile to be released and mixed with the chyme.
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Small intestinesChemical breakdown of carbohydrate, protein and fats into smaller absorbable molecules takes place.
#digestion #absorptionbegins
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Peristaltic waves of muscular contraction mix and move the chyme down the duodenum and into the jejunum, measuring about 2.5 m long.
Small intestines
#absorption
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Small intestinesPeristaltic waves of muscular contraction move the chyme through the jejunum until it reaches the ileum.
#absorption
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Small intestinesThe jejunum has a huge surface area created by finger-like structures called villi. These assist with the absorption of nutrients into the bloodstream.
#absorption #villi
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VilliVilli play an important role in absorbing the breakdown products of digestion.The increase in surface area, allows for ready absorption of these products of digestion.
#absorption #villi
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VilliWith villiFlat surface
Nutrients to bloodstream
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VilliEach villus has a rich blood supply, allowing nutrients to be readily absorbed and transported to the liver. A lacteal is also present; absorbing fat nutrients and carrying them to the circulatory system.
#whatyatalkinboutvillus