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Submitted By cheuktsz0202
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Digestive system -- 4 main functions being performed
- Mechanically break downs food, with teeth, tongue, smooth muscle in digestive _____
- Chemically break down food with enzymes: acids
- Reabsorb tiny particles from small intestines into capillaries surrounding sore intestine
- Expel waste : indigestible material, excess lipids, excess H2O, dead cells: bacteria
Parts of digestive system
MouthPharynxesophagus esophageal sphincter Stomach
Mouth- teeth break down food, tongue forms it into a ball of chewed food called a bolus.
Secrete saliva-
- has salivary amylase (enzyme) break down carbohydrates
- also has lysozyme enzyme to attack bacteria
- contain H2O to help lubricate bolus as we swallow
Pharynx- leads to both respiratory (larynx) : digestive (esophagus) systems
Esophagus- Z layers of smooth muscle which contract in wave-like contraction called peristalsis
Esophageal sphincter - smooth muscle which allows bolus to enter the stomach (if sphincter allows acid “chime” (bolus that entered stomach) back up into esophagus; it is called heatburn/ GE reflex)
Stomach- 3 layers of smooth muscle which clowne up the chyme (chewed food) + enzymes to help digest: pepsin help digest proteins: to help digest lipids
Gastric acid also help break down chyme
Stomach line with mucus so that we don’t digest our own stomach lining too fast; we still need to replace stomach lining calls: continually
We secrete a hormone called Ghrelin from the stomach that is an appetite stimulator – when stomach is near empty this hormone triggers hypothalamus in brain to register that you are hungry
Pyloric sphincter lets in a squirt of chyme at a time into the small intestine
Small intestine has 3 parts
1. duodenum (chyme is broken even more)- has secretions from the pancreas(insulin goes to blood, accessing glands, lots of the digestive enzyme go into the small

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