Activity 14Activity 14

BreakdownBreakdown

Pages B-19 to 22Pages B-19 to 22

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Main IdeasMain Ideas

Graphing data can reveal patterns that Graphing data can reveal patterns that are not apparent from data tables.are not apparent from data tables.

Each system within the human body is Each system within the human body is defined by the functions that it performs. defined by the functions that it performs. For example, the digestive system is a grFor example, the digestive system is a group of organs, each of which contributes oup of organs, each of which contributes to the process of breaking down food intoto the process of breaking down food into smaller particles. smaller particles.

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Main Ideas cont. Main Ideas cont.

Creating models is one way to understand and Creating models is one way to understand and communicate scientific information. communicate scientific information.

Both mechanical and chemical processes Both mechanical and chemical processes contribute to the breakdown of food. contribute to the breakdown of food.

Chemical reactions occur at surfaces. The Chemical reactions occur at surfaces. The greater the surface area available for contact, greater the surface area available for contact, the faster the reaction. This is why mechanical the faster the reaction. This is why mechanical breakdown facilitates chemical breakdown. breakdown facilitates chemical breakdown.

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Vocabulary Vocabulary

ControlControl Digestive SystemDigestive System FunctionFunction HypothesisHypothesis ModelModel OrganOrgan Qualitative/Quantitative DataQualitative/Quantitative Data VariableVariable

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Vocabulary Cont. Vocabulary Cont.

Mechanical Breakdown*-Occurs when you Mechanical Breakdown*-Occurs when you chew your food. Gets help from your teeth and chew your food. Gets help from your teeth and tongue. Also continues in the stomach where tongue. Also continues in the stomach where stomach churns the food around. stomach churns the food around.

Chemical Breakdown*-Occurs when Chemical Breakdown*-Occurs when substances in your body breakdown food into substances in your body breakdown food into even smaller particles. Chemical breakdown even smaller particles. Chemical breakdown begins in the mouth, but occurs mostly in your begins in the mouth, but occurs mostly in your stomach and intestines. stomach and intestines.

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Challenge QuestionChallenge Question

By the end of this activity you should be By the end of this activity you should be able to answer this question…able to answer this question…

Why is it important to chew your food?Why is it important to chew your food?

Practice!!!Practice!!!

Read the procedure. Follow the Read the procedure. Follow the directions in your group.directions in your group.

Record your observations.Record your observations.

For Part 2: You will need a For Part 2: You will need a lab sheetlab sheet..

What do I do?What do I do?

Do part 2, GET MY APPROVAL FIRST!!! Do part 2, GET MY APPROVAL FIRST!!! Be sure to answer the bulleted questions Be sure to answer the bulleted questions

in your notebook and create your in your notebook and create your hypothesis. hypothesis.

AnalysisAnalysis

Do #1 and #2 with your group.Do #1 and #2 with your group. Do #3, #4, and #5 alone. Do #3, #4, and #5 alone.

Challenge QuestionChallenge Question

Your should be able to answer this Your should be able to answer this question now!!!!question now!!!!

Why is it important to chew your food?Why is it important to chew your food?