Body Organization, Transport & Movement — Investigation · Life Science & Scientific Inquiry, Grade 7
Five focused units, a three-session investigation, chapter review, and chapter quiz.
Build a body-system pathway model
Investigate
How do exchanges, transport, and cellular work connect?
Materials
- Supplied pathway records
- Paper for labeled arrows and a notebook
Before you begin
This is a diagram investigation. No physical exertion, breath holding, bodily sample, or personal medical information is required.
Plan a fair test
Compare two supplied diagrams using the same arrow meanings and organism model. This is a mechanism comparison rather than a controlled health experiment.
Method
- Identify each diagram’s boundary and arrow legend.
- Trace food molecules and oxygen separately from external source to cellular use.
- Add omitted exchange surfaces and transport connections to the incomplete diagram.
- Explain how material and information arrows differ from force arrows.
- Identify two omissions and propose evidence that would test one modeled link.
Illustrative course data — use for analysis without equipment
Illustrative records: these are invented teaching data, not published measurements or the learner’s own observations. Actual measurements may differ; record them separately if you perform an optional suitable activity.
| Record | Supplied pathway |
|---|---|
| A | Digestion → absorption → blood transport → tissue exchange → cellular use |
| B | Lungs → directly to muscle; no blood pathway or exchange shown |
Analyze and explain
- What must be added to B?
- Where does cellular respiration occur?
- Which parts of this model are not literal scale anatomy?
What a strong explanation includes
- Explain the relevant biological process accurately.
- Use the supplied evidence and show calculation steps with units where needed.
- Connect a labeled model or mechanism with the claim.
- State an assumption, evidence limitation, or useful next observation.
Parent / teacher guide: discuss after the investigation
B needs lung-to-blood exchange, heart and vessel transport, and tissue exchange before cellular use. A separates digestion, absorption, and transport, but is still a simplified pathway. Cellular respiration transfers food energy in cells; breathing is air movement. Label materials and processes, state scale omissions, and avoid using a diagram to assess an individual’s health.
Compare this model with the learner’s actual evidence. Different measurements can support a different conclusion; check the reasoning and limitations, not matching wording.