The circulatory system transports oxygen, nutrients, wastes and heat. The heart provides pressure, arteries carry blood away from the heart, veins return it, and thin capillaries allow exchange with tissues. Blood components also have specialised transport and defence roles.
Example
Red blood cells carry oxygen from lung capillaries through the heart and arteries to body cells, then return with less oxygen through veins.
Key terms
Artery:
A blood vessel that carries blood away from the heart.
Vein:
A blood vessel that carries blood toward the heart.
Capillary:
A tiny thin-walled vessel where substances are exchanged with tissues.
Questions
1. Which statement best captures transport in the circulatory system?
Different parts of the circulatory system have structures suited to transport and exchange.
All arteries carry oxygen-rich blood and all veins carry oxygen-poor blood.
The pattern can only be explained by guessing.
The topic has no observable evidence.
2. Which term means "A blood vessel that carries blood away from the heart."?
Artery
Vein
Capillary
Variable
3. Which term means "A blood vessel that carries blood toward the heart."?
Vein
Artery
Capillary
Conclusion
4. Which term means "A tiny thin-walled vessel where substances are exchanged with tissues."?
Capillary
Artery
Vein
Prediction
5. Which observation task is most relevant to this topic?
Compare artery, vein and capillary diagrams, recording differences in wall thickness, lumen and valves.
Copy the topic title without looking at an example.
Choose a result before making observations.
Ignore details that do not match a first guess.
6. Which model would best represent the key process or relationship?
Map one red blood cell's path through the lungs, heart and body using arrows and chamber names.
A decorative drawing with no labels or connection to evidence.
A list of unrelated facts.
A model that deliberately contradicts every observation.
7. Which investigation is focused most directly on the scientific idea?
Measure resting pulse, then pulse after one minute of safe light movement, and compare the results.
Change many uncontrolled factors and record nothing.
Ask only for opinions and treat them as measurements.
Repeat a memorised answer without testing it.
8. Which evidence best supports the lesson explanation?
Capillary walls are one cell thick, supporting rapid exchange between blood and nearby cells.
All arteries carry oxygen-rich blood and all veins carry oxygen-poor blood.
One preferred answer with no observation.
A claim that cannot be checked in any way.
9. Which task applies the science in a new context?
Use vessel structure to explain why arteries withstand high pressure and veins often contain valves.
Write the heading again without explaining it.
Ignore the system and choose randomly.
Assume the same answer fits every situation.
10. Which response best corrects the misconception in this topic?
Different parts of the circulatory system have structures suited to transport and exchange.
All arteries carry oxygen-rich blood and all veins carry oxygen-poor blood.
Both statements must be equally correct.
Evidence cannot help decide between explanations.
11. What makes a scientific observation useful?
It records relevant details without changing them to fit an expectation.
It includes only details that support a preferred answer.
It replaces measurements with guesses.
It hides the conditions under which it was made.
12. Why should a scientific model include its limitations?
Models simplify reality, so users need to know what the representation leaves out.
A limitation proves the model has no value.
Models are exact copies and never omit anything.
Limitations should be hidden so a model looks certain.
13. What makes a comparative investigation fair?
Change or compare the intended factor while keeping other relevant conditions consistent.
Change every condition at the same time.
Measure only the result that looks best.
Decide the conclusion before collecting data.
14. Why repeat measurements or use several samples?
To reveal variation and reduce the influence of chance or one unusual result.
To guarantee a preferred conclusion.
To make units unnecessary.
To remove the need for a clear method.
15. What is the best response to an anomalous result?
Record it, check the method and investigate whether it is error or meaningful variation.
Delete it automatically.
Delete all other results instead.
Assume it proves the whole topic wrong.
16. Which conclusion is scientifically responsible?
One that answers the question, uses the evidence and states important limits.
One that claims more than the data show.
One that ignores conflicting evidence.
One based only on the expected answer.
17. What would make the claim about transport in the circulatory system stronger?
Several relevant, repeatable evidence lines that agree with the explanation.
A larger heading and no new evidence.
Removing results that are inconvenient.
Relying on a single uncheckable opinion.
18. What should happen if reliable new evidence conflicts with a model?
The model should be reviewed and revised or replaced if needed.
The evidence should always be hidden.
The original model must never change.
Scientists should stop asking questions.
19. How should safety and ethics shape an investigation?
Risks, people, living things and environments should be considered before the method is used.
Safety matters only after data collection.
Any method is acceptable if it is fast.
Ethics has no place in science.
20. What makes science communication trustworthy?
Clear methods, accurate terms, relevant evidence and acknowledgement of uncertainty.
Certainty without evidence.
Leaving out how results were obtained.
Using dramatic language instead of data.
21. What is the strongest overall outcome from studying transport in the circulatory system?
Use observations, models, investigations and evidence to explain and apply this idea.
Memorise the title without using it.
Avoid testing explanations.
Treat every first idea as permanently correct.
Answer key (parent copy)
1. Different parts of the circulatory system have structures suited to transport and exchange.
2. Artery
3. Vein
4. Capillary
5. Compare artery, vein and capillary diagrams, recording differences in wall thickness, lumen and valves.
6. Map one red blood cell's path through the lungs, heart and body using arrows and chamber names.
7. Measure resting pulse, then pulse after one minute of safe light movement, and compare the results.
8. Capillary walls are one cell thick, supporting rapid exchange between blood and nearby cells.
9. Use vessel structure to explain why arteries withstand high pressure and veins often contain valves.
10. Different parts of the circulatory system have structures suited to transport and exchange.
11. It records relevant details without changing them to fit an expectation.
12. Models simplify reality, so users need to know what the representation leaves out.
13. Change or compare the intended factor while keeping other relevant conditions consistent.
14. To reveal variation and reduce the influence of chance or one unusual result.
15. Record it, check the method and investigate whether it is error or meaningful variation.
16. One that answers the question, uses the evidence and states important limits.
17. Several relevant, repeatable evidence lines that agree with the explanation.
18. The model should be reviewed and revised or replaced if needed.
19. Risks, people, living things and environments should be considered before the method is used.
20. Clear methods, accurate terms, relevant evidence and acknowledgement of uncertainty.
21. Use observations, models, investigations and evidence to explain and apply this idea.