Aka Physical digestion is break down of goods using physical processes to increase the surface area and the efficiency of chemical digestion.
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examples of physical break down processes
- Chewing - slicing - grinding - squeezing - Etc
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First place where Mechanical digestion happens
Mouth - Teeth cut, slice, grind up food into smaller pieces - Tongue pushes/ food against hard palate
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Second place where Mechanical digestion happens
Esophagus - 2 muscle layers squeeze food/bolus as it moves to the stomach (peristalsis). Longitudinal compress, rings move down
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3rd place where Mechanical Digestion happens
Stomach - 3 muscle layers contract very tightly to break food down
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4th place where mechanical digestion happens
Small intestine - Squeezing, mixing with bile + enzymes
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Where does Mechanical digestion happen?
Mouth Esophagus Stomach Small intestine
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What is your Esophagus lined with, and why?
Its lined with mucus & saliva to reduce the friction between the esophagus & bolus Mucus prevents hydrochloric acid from eating the stomach
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What does Emulsification do
increases the efficiencies and creates more surface area
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What is chemical digestion
the break down of food by acid & enzymes into macronutrients that can be absorbed by the body
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Where does Chemical digestion happen?
Mouth Stomach Small intestine
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First place food is chemically digested
Mouth Salivary glands makes & secrete salivary amylase to break down starch into complex carbohydrates which are called polysaccharides (Many, sugars) *Starch is where the sugar in the plants is*
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2nd place food is chemically digested
Stomach - Its going to make & release hydrochloric acid until the pH level drops to 2.4 - Next pepsin & pepsinogen breaks down protein into polypeptides
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3rd place food is chemically digested #1
Small Intestine Pancreas makes & releases Lipase breaks down lipids (fats) into fatty acids and glycerol, which can be absorbed in the blood stream
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3rd place food is chemically digested #2
Small Intestine Pancreas makes & releases Protease which breaks down polypeptides into amino acids, which can be absorbed
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3rd place food is chemically digested #3
Small Intestine Pancreas makes & releases Pancreatic amylase to break polysaccharides into monosaccharides, which can be absorbed.
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What happens when absorption goes wrong?
- Diarrhea - Constipation
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What is Diarrhea?
Not enough water is absorbed through the large intestine because the feces moves to quickly
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Why does Diarrhea happen?
When lining of Large intestine irritated by: - foods that are spicy, greasy, or too acidic - Food intolerances - too much fiber - Illness (usually bacteria)
Causes watery, loose stool
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What is constipation?
Too much water is absorbed through the large intestine because either move too slow or sits too long
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Why does constipation happen?
- Dehydration - low water intake - Diarrhea - not eough fiber - holding in you poo