1. Sample PK Question

• a
• c
• b
• d

2. The emotions graphs show the connection between the Circulatory system and .

3. How do these graphs show that the digestive system and the circulatory system are connected?

• The Sleep after Alcohol graph shows that what we consume can change our heart rate hours after we consume it.
• The Microsoft interview graph shows the length in time between meals can affect the heart’s ability to remain stable.
• The Hockey graph shows that there’s a link between the food eaten and the amount of energy the heart has to beat.
• The Running graph shows the connection between the amount of energy that muscles need over time and the changes in heart rate.

4. One of your classmates makes the following claim while looking at the restful sleep graph:



“This graph clearly shows the interaction between the digestive system and the circulatory system. Their heart rate drops over time while they sleep. As they person sleeps for longer, their heart rate drops lower and lower because there’s less food being digested.”



Which statement below accurately evaluates how well this statement is supported by evidence?

• Their claim isn’t supported by nearly enough evidence. There are too many other body systems and variables that could change this person’s heart rate.
• Their claim is mostly supported by the evidence. Even through the person can’t eat food, they still may be digesting some of the food they ate before going to bed.
• Their claim is somewhat supported by evidence, but not much. There could be a connection between heart rate and food, but we don’t know enough about what foods they ate to be sure.
• Their claim is well supported by the evidence. People can only eat when they’re awake and it’s obvious that the drop in heart rate is due to lower amounts of blood sugar.

5. One of your classmates doesn’t believe that the evidence presented here is valid or reliable. Which of the following would lead you to agree with them?

• A student in your class used a heart rate monitor on themselves and their results from playing basketball were different from the hockey graph.
• A news article on meditation describes experiments where people were able to slow down their heart rate while in stressful situations by breathing slowly.
• A scientist claims that heart rates increase due to mental stress as much as they might when you’re running a marathon.
• A news article accuses the company of publishing false data to help them sell more heart rate monitors.

6. What reasoning can be used to support your claim and evidence to explain how the body systems interact with each other?

7. Looking at the Microsoft interview graph, write a claim to answer the following question: How do the body systems interact with each other? Are these systems part of any larger systems? Be sure to include at least two systems and provide two pieces of evidence for each system to support your claim.

8. What scientific evidence can be used to support your claim about how the body systems interact with each other?