1. Living Things need… Water Oxygen Energy (food)
Able to respond to environmental changes
Protection ( shelter, specific structures, etc)
Sunlight (plants and humans)

2. Homeostasis: The state that organisms want to be in
Homeostasis by Sheldon on Big Bang Theory

3. Organs are structures that have a specific job.
These are the organs of the respiratory system.
The respiratory system is used to obtain oxygen and
get rid of carbon dioxide.

4. In this lab, you will examine changes in the breathing rate by counting the number of breaths per minute. Changing the breathing rate means changing how much oxygen and carbon dioxide gets in and out of body.
The diaphragm muscle contracts and relaxes which causes the air to rush in and then out of the body. Inhale – air rushes in Exhale – air rushes out Inhale + Exhale = Breath

5. Determining Breathing Rate: click on the links below.
How to Take a Breathing Rate
Counting Breathing Rate
Your average breathing rate is your homeostatic condition. The average
Breathing rate for a normal teenager is breaths per minute.
Now that you know how to determine breathing rate, let’s do the lab…..

6. Lab #1 Homeostasis: Investigating Breathing Rates
Objective: Illustrate a homeostatic condition, disrupt the condition and summarize the findings
Read the introduction to the lab… What is your hypothesis?
A complete hypothesis describes what will happen and why. It answers the
question of the investigation

7. So what happened in the lab?
Sitting
Running
Marching
Trial 1 17 22 25
Trial 2 14 24 27
Trial 3 16 28 33
Average
15.5
24.6
28.3
Sitting
Running
Standing on one foot
Trial 1 16 28 17
Trial 2 14 32 18
Trial 3 15 30 19
Average

8. Did you make a correct bar graph?
The data in the previous slide can be presented using a bar graph.
How to Make a Bar Graph
Good for showing comparison of two or more comparisons.
The x-axis is the independent variable.
The y-axis is the dependent variable.
Did you make a correct bar graph?

9. Data from Another Investigation
How does this data compare with your data?
What can you conclude about breathing rate and type of activity?

10. Experiment Vocab
Hypothesis – a written statement explaining what may happen and why
Data – observations or facts collected during an investigation or experiment
Conclusion – a written statement of what actually happened during the investigation using data to support it and stating whether the hypothesis was correct or not correct

11. Data Comparison for Two Investigations
Same
Both presented in bar graphs
Both discovering the breaths per minute for an activity
Resting both had the lowest breaths per minute
Different
Set up of investigation different b/c the time for activity changed before taking breaths per minute
Conclusion: The stronger the activity always had
A higher breathing rate. This proves the hypothesis
Which stated that the breathing rate would go up with
Exercise because more oxygen was needed for energy.

12. Why does breathing rate go up when activity level changes?
Body wants to maintain homeostasis
Sitting is the set point ( Sheldon condition)
Running is a change (Sheldon annoyance)
Body needs more oxgyen for cellular respiration
Body needs to get rid of carbon dioxide
Body needs to keep the blood neutral condition

13. 1. Using different colors, highlight
the terms receptor, control center,
effector, and set point. On the back of
the paper, define each.
Box the receptor in the diagram
using the same color chosen for the
term. Do the same for control center,
effector and set point
Answer the “Why” questions on
the diagram.
On the back of the diagram, how
you describe how a negative feedback
loop works.
What would happen if the
Negative feedback loop did work?
Be specific. Don’t just say, die.

14. Why is the heart rate going up after each person does the activity?

15. Negative Feedback Loop: a way to get back to normal condition
Remember what Sheldon did to get back to normal.