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Activity 14 b breakdown
- 1. Body Works Activity 14B: Breakdown October 1, 2014
- 2. Activity 14B: Breakdown October 1, 2014 Getting Started: Which would dissolve faster, complete uncut rib-eye steak or a rib-eye steak that has been cut into pieces? Explain your reasoning. Introduction: Read and summarize pg B-19 in one sentence. Breakdown You already know the organs in the digestive system. But what exactly do they do? One important function of the digestive system is to break down food into smaller pieces. Only then can the nutrients in the food be absorbed by your body Why is it important to chew your food? 14B Challenge: Rewrite the challenge question in your own words.
- 3. Key Words: Chemical Breakdown, control, digestive system, function, mechanical breakdown, organ, qualitative/quantitative data, surface area, variable Procedure: Have you read and do you understand the procedure part A on pg. B-20? Write one sentence that describes what you will be doing. Results: The Model Elements of the digestive process Student Sheet 14.1 Human Digestive System Analysis: Discussion Questions Reflection: How can understanding how your liver works help you make decisions about your health?
- 4. Elements of the Digestive Process How did you decide when the chemical breakdown was over? Did you observe or record how long it took before the tablet piece completely dissolved?
- 5. Testing the Model What are your observations? What did you see, hear, smell? Based on your observations, why your think it is important to chew your food?
- 6. Key Words: Chemical Breakdown, control, digestive system, function, mechanical breakdown, organ, qualitative/quantitative data, surface area, variable Procedure: Have you read and do you understand the procedure part B on pg. B-21? Write one sentence that describes what you will be doing. Results: Pre-Lab and pre-lab discussion Conduct Experiment Work on Bar-Graph Student Sheet 14.1 Human Digestive System Candy Time Analysis: Complete Conclusion
- 7. Experimental Design Elements Independent and Dependent Variables Hypothesis Controlled Variables
- 8. Independent and Dependent Variables Independent Variables (IV) IV means I control Its the part of the experiment you are testing. Dependent Variables (DV) DV depends on the IV It is the thing you are measuring
- 9. Example IV - food people eat Dr. Goldberger decided to test if food was causing people to get sick so he gave some people fruits and vegetables and others corn, fatback, and syrup. DV whether or not people get pellagra Dr. Goldberger checked the people to see who got Pellagra and who did not.
- 10. What is the independent variable? Asked another way: What are we testing?
- 11. What is the dependent variable? Asked another way: What are we measuring?
- 12. Hypothesis Educated guess or prediction Always stated: If IV then DV This means you plug in the independent variable where it says IV and plug in the dependent variable where it says DV and rewrite your hypothesis.
- 13. Example Using the Dr. Goldberger example. IV = different types of food DV = if they got pellagra Write a hypothesis that follows the format: If IV then DV If different types of food then if they get Pellagra If people eat food with vitamins then they will not get pellagra.
- 14. Controlled Variables or Constant Variables Different then control or control group. These are things that could change every time you did the experiment if you didnt control them. Take Dr. Goldbergers experiment. These are all things that could effect the experiment so they have to be done exactly the same for each person. We assume the patients all ate exactly the same diet maybe they didnt. Or if some exercised while others did not. Or if some were able to shower and wash while others were not.
- 15. What are some of the variables we need to keep the same in this experiment? How will we control them?
- 17. Pre-Lab Discussion Question we are trying to answer How does the size of your food affect the speed at which chemical breakdown occurs? OR Does the amount you chew your food affect your ability to digest it chemically?
- 19. Candy Time Some of you will get a piece of candy that is whole (complete). The rest of you will get candy that has been broken down into smaller parts. Time how long it takes you to finish your candy. Record what your body was doing on student sheet 14.1 and how that helped in digestion.
- 20. Conclusion Restate your hypothesis and explain whether it was correct or incorrect. Use data you collected to support your answer. Restate the problem statement and answer it using data you have collected.
- 21. Amt of vinegar (mL) Time to dissolve (sec) 1 2 3 4 5 6 7 Total 0 2.5 5 10
- 25. Analysis Question 2 What part of digestion was modeled by breaking the tablet? What part of digestions was modeled by adding the vinegar?
- 26. Analysis question 4 How does the size of your food affect the speed at which chemical breakdown occurs?
- 27. Analysis Question 5 Besides preventing choking, why is it important to chew your food?