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Y8 Humans 01 breathing
- 3. The Respiratory System Ribs – to protect the chest Bronchioles Bronchi Trachea – has stiff rings of cartilage to prevent it collapsing Rib muscles – to raise and lower the ribs Lung Diaphragm – muscular sheet Alveoli (“air sacs”) – gas exchange takes place here
- 6. Why are these so different? Explain why we need to take in oxygen and get rid of carbon dioxide.