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## Activity 10.1 **Aim:** To make a model showing the mechanism of breathing through lungs **Materials required:** * Two balloons * A bell jar * A rubber cork with a single hole * One rubber sheet * Y-shaped glass tube **Method:** * Take two balloons and fix them on the arms of a Y-shaped tube....

## Activity 10.1 **Aim:** To make a model showing the mechanism of breathing through lungs **Materials required:** * Two balloons * A bell jar * A rubber cork with a single hole * One rubber sheet * Y-shaped glass tube **Method:** * Take two balloons and fix them on the arms of a Y-shaped tube. * Pass the Y-shaped tube through the rubber cork by making a hole. Make sure it is airtight. * Now fix the cork on the bell jar as shown in fig 10.4. * Fasten a rubber sheet over the base of the bell jar and gently pull it down. **Observation:** * When the rubber sheet is pulled down, the space in the bell jar increases, and the air pressure inside the bell jar decreases. ## Breathing Mechanism Experiment **Let's mark the following statements True (T) and False (F):** 1. **The air breathed through the trachea.** **T** 2. **Alveoli are the unit of respiration.** **T** 3. **In the cell, energy is produced by breaking down carbon dioxide and water and releasing oxygen.** **F** 4. **When we inhale air, the rib cage moves down and inwards while the diaphragm moves up.** **F** 5. **The rib cage is an important part of the respiratory system.** **T** ## Activity 1: **Aim:** To show that carbon dioxide is released during respiration. **Materials needed:** * A conical flask