Download - Digestion of a Meal
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Digestion of a MealDigestion of a Meal
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Digestion of a MealDigestion of a Meal
time taken for food to pass through the digestive system depends on:
1. type of diet
2. amount of fibre present
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Digestion of CarbohydratesDigestion of Carbohydratescarbohydrases:
general name for all enzymes that break down carbohydrates
stored in: various glands ex.
salivary pancreas small intestine
liver and muscles to: break down glycogen
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Digestion of CarbohydratesDigestion of Carbohydrates
polysaccharides
maltose
maltase→
glucose
→amylase
…..1000’s
starch
glycogen
→ disaccharides → monosaccharides
GluGlu
- made in salivary glands
& pancreas
- works in mouth &
duodenum
- made in duodenum
- work in duodenum
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Digestion of CarbohydratesDigestion of CarbohydratesNote: Other disaccharides are also chemically digested into monosaccharides in the duodenum.
sucrose
lactose
sucrase→
lactase→
fructose
glucosegalactose
F Glu
GluGal
glucose
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Digestion of ProteinsDigestion of Proteins
proteases: general name for all enzymes
that break down proteins
cannot be stored in active form because:
it would digest organ parts
therefore stored as inactive enzymes
when secreted into the digestive tract, chemicals present activate enzyme
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Digestion of ProteinsDigestion of Proteins
Example:
Stomach: + →(inactive enzyme) (active
enzyme)
HClpepsinogen
pepsin
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Digestion of ProteinsDigestion of Proteins
protein peptides amino acids
100’s ….- made in stomach
- works in stomach
pepsin trypsin
- made by pancreas
- works in small intestine
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Digestion of LipidsDigestion of Lipidslipases:
general name for all enzymes that break down lipids
stored in: various glands: ex.
pancreas small intestine
fatty tissue under the skin
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Digestion of LipidsDigestion of Lipids
glycerol fatty acid
fat globulesmaller
fat globule
glycerol &
3 fatty acids
lipase
(chemical digestion)
bile
(physical digestion)
emulsification
- made by liver
- works in duodenum
-made by pancreas
- works in duodenum
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Exocrine vs. Endocrine GlandsExocrine vs. Endocrine Glandsgland:
organ that produces & releases a secretion
exocrine gland:organs that release their secretions
into ducts (tubes) such as:
sweat glands
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Exocrine vs. Endocrine GlandsExocrine vs. Endocrine Glandsexocrine glands: (continued)
mammary glands
digestive organs: ex. salivary glands
pancreas
liver
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Endocrine vs. Exocrine GlandsEndocrine vs. Exocrine Glands
endocrine gland: organs that release hormones
directly into the blood (not through ducts)
examples: testes → testosterone ovaries → estrogen pancreas → insulin
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Hormonal Control of DigestionHormonal Control of Digestion important so that secretions are only released
when the appropriate food is present hormones (chemicals that control metabolic
pathways) get to their target tissue via the blood stream
stimulus: target tissue: response:
action that triggers a responsetissue that is affected by hormone
action tissue produces as a result of hormone binding
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Hormonal Control of Protein DigestionHormonal Control of Protein DigestionHormonal System
Gastrin Secretin
Gland
Stimulus
Target Tissue
Response
Role of Released Substance
cardiac sphincter cellsprotein in food
stomach lining
Release:1. HCl2. pepsinoge
n
Release:sodiumbicarbonate
1. activates pepsin2. digest amino
acid chains
duodenal gland cells
acidic chyme
pancreas cells
neutralizes acidity in chyme
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HomeworkHomework
Complete ‘Chemical Digestion
of Nutrients’ Handout