Opening your next discovery…
Does moving the chest prove that fresh oxygen reached the cells?
Your discovery goalRelate diaphragm/rib movement to ventilation and distinguish alveolar exchange from cellular respiration.
Mapping checkedA prediction is a starting idea. You can revise it after exploring.
Use at least 40 characters and include an observation. Your writing is saved as evidence; it is not automatically judged for accuracy.
This records completion of this demonstration. It is not an official grade or a claim of mastery.
Compare controlled chest movements, test a sealed-airway counterfactual and distinguish gas exchange from energy release.
Relate diaphragm/rib movement to ventilation and distinguish alveolar exchange from cellular respiration.
State what you changed. Describe the result using an observation from the model. Connect the observation to the idea you are learning, then try a different case to test your explanation.
Build on what you know. Discover where it leads.
Open the learning mapCurrent body re-inspected for breathing mechanism, alveolar exchange, respiration distinction and generic heart/blood/vessel transport. The original four-station transport loop is explanatory enrichment; named chambers and vessel types are not required VII objectives here. SHA-256 9c8e63c21665340a87b7cce86f44f118fcd5f99a9f555bcc3925ba883ad0a0fb.
Actual 2026–27 chapter body, catalogue and pulmonary-vessel diagram inspected. Supports bounded X revision and clearly labelled optional named chamber/vessel extension. No full Life Processes coverage; X detail is not used to establish VII placement. SHA-256 685ec7228afeb79d7bc9b989648e381e5eb4b5a6d290d6a13374489c9284054f.
Mapping scope: VII mechanism/distinction and bounded X revision supported separately. Comparison indices are original, not measured physiology.
The explanations, models and assessments on labs.bodhiclasses are original learning activities. An official reference establishes curriculum context; it does not imply approval of this activity by CBSE or NCERT.
Investigate how a moving diaphragm changes chest space. Record a fair two-cycle comparison, then test an airway that is sealed in this model. Follow oxygen and carbon dioxide across an enlarged alveolar boundary before deciding which process releases energy.
Cycle not yet advanced. Diaphragm remains at the resting dome; ribs remain at the resting position; chest-space index 100. Air follows nose → windpipe → branching tubes → alveoli. Oxygen crosses from alveolar air into blood; carbon dioxide crosses from blood into alveolar air. The inset shows exchange directions, not a measurement of gas rates.
Indices compare settings: added space = 0.65 × diaphragm displacement + 0.35 × rib lift. Fresh-air entry equals added space for an open airway, zero across a sealed opening. These values are not litres, pressure or oxygen uptake. Sealed air already inside may still change volume; this sketch does not simulate that compression.
| Trial | Diaphragm | Ribs | Airway | Space index | Entry index |
|---|
Seal the airway, advance inhalation at a nonzero expansion, then predict fresh entry. Use the enlarged boundary to distinguish gas transport and chemical energy release.
Sealed-airway counterfactual observed: not yet.
Original user-stepped process sketch and uncalibrated comparison indices. Shapes and proportions are not anatomical measurements; the alveolar boundary is enlarged. The model omits residual air, pressure, elastic recoil, detailed airflow, gas concentrations and blood-flow limits. Sealed fresh-air entry does not mean trapped gas cannot expand. No personal breathing task, health test or advice is provided. VII core and bounded X revision are source mapped separately; this does not complete either chapter.
