16-2 The Digestive Process Begins Parrot Book Pages 518-523.
8th Grade Ch 2 Sec 3 The Digestive Process Begins
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Transcript of 8th Grade Ch 2 Sec 3 The Digestive Process Begins
![Page 1: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/1.jpg)
Ch. 2 Sec. 3 The Digestive Process
Begins
![Page 2: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/2.jpg)
3 main functions
of digestive system
Digestionbreaks down
food into molecules
body can use
Absorptionmolecules absorbedinto blood & carried thru. body
Eliminationwastes
eliminatedfrom body
![Page 3: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/3.jpg)
2 kinds of digestion
mechanical chemical
food ground intosmall pieces
large food moleculesbroken small
molecules by enzymes
![Page 4: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/4.jpg)
Path of digestion
![Page 5: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/5.jpg)
1. mouth- releases saliva- moistens food
![Page 6: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/6.jpg)
• chemical digestion:enzyme- protein
speeds chemical reactions
• mechanical digestion- teeth
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![Page 8: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/8.jpg)
2. esophagus
• muscular tube - connects mouth stomach
• lined w/ mucus
![Page 9: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/9.jpg)
flap of tissue that seals off windpipe-prevents food from entering lungs
![Page 10: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/10.jpg)
2. esophagus
• peristalsis= involuntary waves of muscle contractions that move food stomach
![Page 11: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/11.jpg)
3. stomach-• most mechanical digestion occurs here
• some chemical digestion
–enzymes- pepsin
–hydrochloric acid
![Page 12: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/12.jpg)
Mechanical digestion in the stomach
is like the clothes and soapy water
mix in a washing machine.
YouTube video-digestion
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Review
![Page 14: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/14.jpg)
3 main functions
of digestive system
Digestionbreaks down
food into molecules
body can use
Absorptionmolecules absorbedinto blood & carried thru. body
Eliminationwastes
eliminatedfrom body
![Page 15: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/15.jpg)
peristalsisinvoluntary waves of
muscle contractions that
move food stomach
![Page 16: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/16.jpg)
stomach-
most mechanical digestion occurs here
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hydrochloric acid
very strong acid found in digestive juices
![Page 18: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/18.jpg)
flap of tissue that seals off windpipe-prevents food from entering lungs
![Page 19: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/19.jpg)
![Page 20: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/20.jpg)
pepsinenzymes that chemically
digests proteins- breaks them down into amino acids
![Page 21: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/21.jpg)
esophagus
• muscular tube - connects mouth stomach
• lined w/ mucus
![Page 22: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/22.jpg)
2 kinds of digestion
mechanical chemical
food ground intosmall pieces
large food moleculesbroken small
molecules by enzymes
![Page 23: 8th Grade Ch 2 Sec 3 The Digestive Process Begins](https://reader034.fdocuments.in/reader034/viewer/2022052600/55845dd6d8b42ad1588b457e/html5/thumbnails/23.jpg)
salivaYour mouth releases ______ to moisten food.
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• enzyme protein that speeds
up chemical reactions