Question

Division of mammalian lungs into a very large number of tiny alveoli around alveolar ducts opening into bronchioles, is

• A. An inefficient system of ventilation of alveoli though with very little residual air
• B. An inefficient system of ventilating the alveoli resulting in very high percentage of residual air in the lungs
• C. A very efficient system of ventilating the alveoli with no residual air
• D. An efficient system of ventilation of alveoli with little or no residual air

Answer 1

The correct option is D An efficient system of ventilation of alveoli with little or no residual air

Though the air in the alveoli is well ventilated, there is still some remaining amount of air which does not take part in ventilation. This volume of air is known as the dead space.