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KCET2026BiologyBreathing and Exchange of Gases

Identify the incorrect statement regarding respiratory system in man.

Options

  1. ALungs are covered by double-layered membrane called pleura.
  2. BThe alveoli are surrounded by rich blood capillaries.
  3. CThe trachea, bronchi and bronchioles are supported by 'O' shaped cartilaginous rings.
  4. DThe right lung is slightly larger than the left lung.

Correct answer

C. The trachea, bronchi and bronchioles are supported by 'O' shaped cartilaginous rings.

Step-by-step solution

The trachea, primary, secondary and tertiary bronchi, and initial bronchioles are supported by incomplete cartilaginous rings, which are 'C' shaped, not 'O' shaped. These incomplete rings prevent the collapse of the airway during breathing. The lungs are covered by a double-layered pleural membrane which reduces friction on the lung surface. The alveoli are highly vascularised and surrounded by a rich network of blood capillaries for efficient gaseous exchange. The right lung is slightly larger and heavier than the

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