clil digestive system 2 - artigianelli.org
TRANSCRIPT
- Bolus—> chyme - Mucus vs. auto digestion
thickenings
StomachKEYWORDS:
- Bag - Gastric juice —> protein digestion (hydrochloric acid HCl + pepsinogen/pepsine) - Cleavage
proteolisis = activation
KEYWORDS: - 7.5 - 8.0 m long - Digestion and absorption
gut-intestine-bowel
SMALL INTESTINE: - 6.5 m long
- duodenum - jejunum - ileum
LARGE INTESTINE: - 1.5 m long
- cecum - colon - rectum
Duodenum
Mild activity
enzymes
STRONG activity
enzymes
Inside the duodenum chyme is definitely decomposed by enzymes: - amylases for carbohydrates, - proteases for proteins, and - lipases for lipids.
produced in the pancreas as inactive
(proenzymes)
become active here thanks to
proteolisis
accumulates bile (gall) that facilitates lipid digestion
Absorption
• once the chyme passes through duodenum it becomes the chyle.
• nutrients in the chyle are absorbed in the small intestine.
Absorption
AbsorptionKEYWORDS:
- villi = projections of the tube - increase in size to 250-300 m2
- blood vessels
Large intestine• absorbs water from what remains of chyle.
• forms the feces.
• recently its role has been revised. We now think that it represents a microenvironment essential for mutualistic microorganism proliferation.
Microbiota• community of microorganisms in the large
bowel.
Rectum• Rectum is the last part of the large intestine
and stores feces before they are expelled.