Digestive System. Digestive System Rap Job of Digestive System Break down food (macromolecules) into...
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Transcript of Digestive System. Digestive System Rap Job of Digestive System Break down food (macromolecules) into...
Digestive SystemDigestive System
Digestive System Rap
Job of Digestive SystemJob of Digestive System
Break down food (macromolecules) into nutrients & energy
Review: MacromoleculesReview: MacromoleculesWhat macromolecules do we eat?Proteins: Meat, Nuts Lipids: Oils, FatsCarbohydrates: Breads, Sugars
Review: Food EnergyReview: Food EnergyWhich macromolecule is our main energy source?
Carbohydrates
Which macromolecule stores the most energy?
Lipids
Review: Food Energy (cont.)Review: Food Energy (cont.)
The Food PyramidThe Food Pyramid
NutritionNutrition
Nutrients: Anything that promotes growth
Vitamins (Vitamin C) Minerals (Iron) Macromolecules
Two Types of DigestionTwo Types of Digestion
Mechanical – physically breaking food into smaller pieces (mouth)
Chemical – food molecules are broken down by acids and enzymes (stomach, small intestines)
Digestive SystemDigestive System
Tracking a Piece of FoodTracking a Piece of Food
1. Mouth2. Esophagus3. Stomach4. Small Intestine5. Large Intestine6. Rectum 7. Anus
SwallowingSwallowing
Peristalsis: wavelike movement of muscles pushes food through digestive tract
My food went down the My food went down the “wrong pipe!”“wrong pipe!”
2 tubes in throat: trachea & esophagus
esophagus connects mouth to stomach How does food know which tube to go down?
epiglottis
3 Jobs of Stomach3 Jobs of Stomach
1. Store food & liquid2. Mix food & digestive
juices (HCl)3. Empty into small
intestine
Digestive JuicesDigestive JuicesAssist in breaking down of food
Ex. Enzymes
Acid Reflux
Small IntestineSmall IntestineAbsorbs greatest amount of nutrients
Covered with tiny finger-like projections – villi
~20 ft long!
VilliVilli
Increase surface area
for better absorption (like a towel)
Large IntestineLarge IntestinePrepares waste for removal by absorbing water
~5 ft long!
Digestion: ‘Helper’ OrgansDigestion: ‘Helper’ OrgansSalivary Glands: produce saliva – starts breaking down carbohydrates
Pancreas: produces enzymes & regulates
glucose levels
Liver:Produces bile
Filters blood
Digestion: ‘Helper’ Organs Digestion: ‘Helper’ Organs (cont.)(cont.)
Gall Bladder: stores bileHelps digest fatty foods
Digestion: ‘Helper’ Organs Digestion: ‘Helper’ Organs (cont.)(cont.)