Cellular Respiration and Exercise (Daniel Hanna)
Title: Cellular Respiration and Exercise
Principle(s) Investigated:
-Cellular Respiration -Lactic Acid Fermentation - Photosynthesis
-Energy -CO2 production -Aerobic vs. Anaerobic
-Acidity / pH
Standards:
LS 1.7 - Use a model to illustrate that cellular respiration is a chemical process whereby the bonds of food molecules and oxygen molecules are broken down in new compounds are formed in a net transfer of energy.
LS 2.3 - Construct and revise an explanation based on evidence for the cycling of matter and flow of energy in aerobic and anaerobic conditions.
LS 2.5 - Develop a model to illustrate the role of photosynthesis and cellular respiration in the cycling of carbon among the biosphere, atmosphere, hydrosphere and geosphere.
Materials:
Chemicals: NaOH, phenolphthalein
Equipment: Erlenmeyer flask, stirring rod, graduated cylinder, 50ml beaker
Procedure:
Part A: Create 2 solutions using 100ml of water, 5 drops of phenolpthalein indicator, and 10 drops of sodium hydroxide. Make sure to cover your control with a rubber stopper or tape.
Part B: Record your test subject's respiratory and pulse rate. Blow into your variable solution using a straw and record how long it takes for the solution to change color. Record how many drops of NaOH is required to turn the solution back to pink (you want to match the control).
Part C: Have the test subject run in place or complete set-ups for 3 minutes. Blow into your variable solution and record how long it takes for the solution to change color and how many drops of NaOH is required to turn the solution back to pink. Record pulse and respiratory rate.
Part D: Have the test subject hold a textbook in each hand directly to the sides of the body for one minute or as long as possible. Blow into your variable solution and record how long it takes for the solution to change color and how many drops of NaOH is required to turn the solution back to pink
How to measure your pulse:
Find a pulse on your wrist or neck. Using a timer, count the beats you feel for 10 seconds. Multiply this number by six to get your heart rate per minute.
How to measure respiratory rate:
Count the number of breaths (chest rise/fall) over a 30 second period and multiply by 2.
Student prior knowledge:
-Students should be familiar with the process of cellular respiration and
photosynthesis
-Students should be aware of fermentation
Explanation: Link
Questions & Answers:
- In which situation did the test subject produce more CO2? Why do you think this happened?
- Is there a relationship between pulse rate and carbon dioxide production? Use your results to explain your answer?
- How does comparing the amount of CO2 produced translate to comparing how quickly cellular respiration is occurring?
Applications to Everyday Life:
-Mitochondrial Defect
-Vital signs (Pulse rate, Respiratory rate, blood pressure, body temperature)
-CO2 production of human beings / livestock --> global warming
Photographs:
Videos: Link