CIE IGCSE Biology: 复习笔记：11.1.7 Function of Cartilage in the Trachea: Extended

• Rings of cartilage surround the trachea (and bronchi)
• The function of the cartilage is to support the airways and keep them open during breathing
• If they were not present then the sides could collapse inwards when the air pressure inside the tubes drops

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