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Mechanical and chemical digestion

Mechanical and chemical digestion

Assessment

Presentation

Science

6th - 8th Grade

Medium

NGSS
MS-LS1-7

Standards-aligned

Created by

Heather Akiyama

Used 162+ times

FREE Resource

6 Slides • 4 Questions

1

Mechanical and chemical digestion

How does food become usable for energy?

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2

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3

Mechanical Digestion

  • Chewing

  • Swallowing

  • Muscles squeezing

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4

Multiple Select

Which of the following help with mechanical digestion

1

Saliva

2

Chewing

3

Stomach Acid

4

Muscular squeezing

5

Poll

Which of the following foods is the best in your oppinion?

Pizza

Burgers

French Fries

Ice cream

Macaroni and Cheese

6

Enzymes

  • An enzyme is a protein that speeds up a chemical reaction.

  • Enzymes work in the digestive system

  • Amylase breaks down carbohydrates

  • Protease breaks down proteins

  • Lipase breaks down fats

  • Like a key in a lock, enzymes help large molecules break into smaller usable pieces

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7

Chemical Digestion

  • Enzymes react with food to separate larger chains of molecules

  • Saliva in the mouth

  • Stomach Acid

  • SMALL INTESTINE (enzymes from liver, pancreas, and small intestine)

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8

Multiple Choice

How does chemical digestion work?

1

Enzymes from the digestive system react with larger molecules to break them into smaller usable molecules

2

Chewing and swallowing food breaks large bites of food into smaller pieces

9

Absorption

  • Amino acids, peptides and glucose are absorbed in the small intestine

  • Micro-villi absorb simple molecules and send them to the bloodstream

  • The bloodstream delivers the nutritients to the cells for use as energy

  • Occurs in SMALL INTESTINE

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10

Fill in the Blank

What does our body use food molecules for once they are delivered to the cells?

Mechanical and chemical digestion

How does food become usable for energy?

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