Percentage of Normal dead space is:-: (A) 50-70, (B) 20-Oct, (C) 30-40, (D) 80-90
Answer is C. Dead space - Some of the air a person breathes never reaches the gas exchange areas but simply fills respiratory passages where gas exchange does not occur, such as the nose, pharynx & trachea. - The air is called 'dead space air' because its not useful for gas exchange. - Normal tidal volume = 500 m - Normal dead space = 150 m Thus, Normal dead space ratio = 30 - 40%