Ch. 3 Sec. 5 Digestion & pH

digestion• breaks down complex molecules of foods into smaller molecules

digestion involves 2 processes:

1. chemical digestion=

breaks large molecules into smaller molecules

digestion involves 2 processes:

2.mechanical digestion

tears, grinds, & mashes large food particles into smaller ones

pH in the pH in the digestive digestive systemsystem

This sandwich is about to begin a journey that includes changes in pH.

mouth

• pH= 7• digestion begins • saliva contains amylase- breaks down carbohydrate into sugars

stomach• pH= 2

• hydrochloric acid & enzymes

• main enzyme= pepsin

–breaks down amino acids

small intestine

• pH= 8• most chemical digestion occurs here

1. Which organ in the digestive

system has a pH of 2 ?

2. In which organ does most chemical

digestion occur ?

3. ______ breaks down complex molecules of foods into smaller molecules.

4. Which organ in the digestive

system has a pH of 8 ?

5. Digestion begins in the _________.

6. main enzyme in stomach-digests protein

7. tears, grinds, & mashes large food particles into smaller ones

8. In which organ is the main enzyme pepsin?

9. breaks large molecules into smaller molecules

10. Which organ in the digestive system has a

pH of 7?

Which organ in the digestive system has

a pH of 2 ?stomac

h

In which organ does most chemical

digestion occur ?small

intestine

digestion

breaks down complex molecules of foods into smaller molecules

Which organ in the digestive system has

a pH of 8 ?small intestine

mouth

digestion begins here

pepsin

main enzyme in stomach-digests protein

mechanical digestion

tears, grinds, & mashes large food particles into smaller ones

stomach

•In which organ is the main enzyme= pepsin?

breaks large molecules into smaller molecules

chemical digestion

mouth

Which organ in the digestive system has a pH of 7?