Edexcel IGCSE Biology 2.47 Ventilation Muscles Questions
Practise linking diaphragm and intercostal muscle actions to thorax volume, pressure and airflow during inhalation and exhalation.
- Syllabus
- First assessment 2019
- Course
- Biology 4BI1
Exam points
- Explain how diaphragm contraction and external intercostal muscle contraction raise the ribcage, increase thorax volume and lower pressure during inhalation.
- Use lung-volume changes over time to explain inhalation or exhalation through diaphragm and ribcage muscle actions.
- Evaluate a bell-jar model by identifying what the rubber sheet and balloons represent and comparing the model with ribs, intercostal muscles and pleural membranes.
Edexcel IGCSE Biology 2.47 Ventilation Muscles Questions question 1
The diagram shows parts of the human respiratory system with some structures labelled.
Explain how contraction of the diaphragm causes air to move into the lungs.
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