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Grade 7 · unit review

Review: Body Systems and Homeostasis

Explain system cooperation and feedback using fictional records.

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Bring the unit skills together

Use these 4 new cases to check your reasoning. Choices are temporary and are not saved to an account, sent to staff or recorded as school grades. Download your current review choices before leaving or reloading.

Unit review questions
1. Which scientific label fits the specifically described step or feature? Supplied case: Food molecules are broken down.
Need a hint?
  • Look for the described feature: breakdown and absorption of food materials.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.
2. Which scientific label fits the specifically described step or feature? Supplied case: Receptor detects a change.
Need a hint?
  • Look for the described feature: detects the regulated change.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.
3. Supplied case 5: measured model units=7; reference model units=9, using the explicitly named quantities. Signed deviation equals measured value minus reference value. What result follows?
Need a hint?
  • Signed deviation equals measured value minus reference value.
  • The model units are not clinical measurements.
4. Which scientific label fits the specifically described step or feature? Supplied case: Model stimulus is not detected.
Need a hint?
  • Look for the described feature: no stimulus signal reaches controller.
  • Compare the given mechanism with the other labels; do not infer unmentioned events.

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

Create a four-panel explanation for “Body Systems and Homeostasis” using one supplied case from each lesson. Include the observation, scientific mechanism or calculation, result and a limitation. You may draw and speak your explanation; all inputs are supplied.

Work on paper or in your own document. Explain the choices you made.

  • Use one supplied case from each of the four lessons.
  • Name the relevant structure, quantity or process in every panel.
  • Show calculations with units or a causal evidence chain.
  • Distinguish source facts from fictional classroom data.
  • State a model limit or a condition that would change the result.
Compare with a model response

Panel 1: A nutrient enters intestinal blood but circulation to tissues stops in the model. What is predicted? Which inference or prediction is best supported? Result: Absorption alone does not deliver that nutrient to distant cells.. Reasoning: Absorption and circulatory transport are cooperating steps with different functions. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 2: A sensor detects rising temperature, a controller changes an output and temperature then falls. What is warranted? Which inference or prediction is best supported? Result: The corrective loop can oppose the initial change.. Reasoning: A functioning negative-feedback pathway links detection, control and response against the disturbance. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 3: Supplied case 1: measured model units=12; reference model units=10, using the explicitly named quantities. Signed deviation equals measured value minus reference value. What result follows? Result: 2 model units. Reasoning: Substitute the supplied values: (12)-(10) = 2 model units. Keep the sign. A deviation does not diagnose a condition. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified. Panel 4: The modeled sensor sends no reading; the controller and effector are otherwise functional. Which limit follows? Which inference or prediction is best supported? Result: The loop lacks the measurement needed for its specified correction.. Reasoning: A missing sensing link can prevent appropriate control even when later components work. Model limitation: only the stated classroom boundary and supplied observations are established; unmeasured real-world performance remains unverified.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.