1. Warm Up
Objective: Scientists will describe the respiratory system by analyzing the stations.
What is the topic?
What will you be doing?
Why is this important?
How will you know if you have done well?

2. Warm Up
Objective: Scientists will describe the respiratory system by analyzing the stations.
What is the topic? Respiratory system
What will you be doing? stations
Why is this important? Understand our body; future career
How will you know if you have done well? Able to describe the respiratory system; completed work

3. Station 1: Carbon Dioxide and Oxygen
Materials: cup filled 1/3 with water, Brymothymol blue, straw, timer
Fill a cup 1/3 with water.
Add drops of Brymothymol blue solution. Brymothymol blue is an indicator that changes to green and then yellow in the presence of carbon dioxide.
Stir with the straw.
Make an observation of the color.
Blow bubbles into the solution. Time how long it takes to change colors. Be sure not to inhale!
Make an observation of the color. How long did it take to change?
Blow bubbles into the solution. Time how long it takes to change colors. Be sure not to inhale!
Add water to fill the cup. Make an observation of the color.
Rinse your cup and put it back on the table. Throw your straw away.

4. Carbon Dioxide and Oxygen
Explain why the color changed each time.
As you breathe out, you are exhaling CO2. Bromothymol blue changes color in the presence of carbon dioxide. Blue  green  yellow
When water was added, it started to reverse because water has oxygen.
2. Why might it have take longer for yours to change color than someone else?
People have different lung capacities. Shortness of breath. May have asthma/cold.

5. Breath sounds Materials: stethoscope, wipe. partners
Clean the stethoscope before use.
Listen to the breath sounds of a partner. Write your observations.
Have your partner complete some exercises— jumping jacks or running in place is best.
Listen to the breath sounds of your partner after activity. Write your observations.

6. Breath sounds
How did your partner’s breath sounds change after exercising?
Before: normal/could not hear anything
After: faster/louder
Why do you think that happened?
When you exercise, you need more oxygen.

7. Balloon Materials: balloon
1. Exhale deeply into the balloon. Make an observation in comparison to the rest of the class.
Observations:
2. Blow the balloon up to capacity. Record how many breaths it took to blow up the balloon.
Observations

8. Model—Extra Credit Materials: clay, clay tools, camera, paper, pen
Create a clay model of the respiratory system. On paper, write what each color represents. Send a picture of your model, paper, and names to Ms. Reed.

9. Stations
Complete the stations from yesterday.