Ch. 2 Sec. 3 The Digestive Process
Begins
3 main functions
of digestive system
Digestionbreaks down
food into molecules
body can use
Absorptionmolecules absorbedinto blood & carried thru. body
Eliminationwastes
eliminatedfrom body
2 kinds of digestion
mechanical chemical
food ground intosmall pieces
large food moleculesbroken small
molecules by enzymes
Path of digestion
1. mouth- releases saliva- moistens food
• chemical digestion:enzyme- protein
speeds chemical reactions
• mechanical digestion- teeth
2. esophagus
• muscular tube - connects mouth stomach
• lined w/ mucus
flap of tissue that seals off windpipe-prevents food from entering lungs
2. esophagus
• peristalsis= involuntary waves of muscle contractions that move food stomach
3. stomach-• most mechanical digestion occurs here
• some chemical digestion
–enzymes- pepsin
–hydrochloric acid
Mechanical digestion in the stomach
is like the clothes and soapy water
mix in a washing machine.
YouTube video-digestion
Review
3 main functions
of digestive system
Digestionbreaks down
food into molecules
body can use
Absorptionmolecules absorbedinto blood & carried thru. body
Eliminationwastes
eliminatedfrom body
peristalsisinvoluntary waves of
muscle contractions that
move food stomach
stomach-
most mechanical digestion occurs here
hydrochloric acid
very strong acid found in digestive juices
flap of tissue that seals off windpipe-prevents food from entering lungs
pepsinenzymes that chemically
digests proteins- breaks them down into amino acids
esophagus
• muscular tube - connects mouth stomach
• lined w/ mucus
2 kinds of digestion
mechanical chemical
food ground intosmall pieces
large food moleculesbroken small
molecules by enzymes
salivaYour mouth releases ______ to moisten food.
• enzyme protein that speeds
up chemical reactions
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