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