6.3 Mechanism of Breathing · Part 4

narrow for enough air to travel through the lungs. This makes the surrounding tissues to vibrate and produces the snoring sound. XI Std Biology-Zoology Chapter- Dead Space Some of the inspired air never reaches the gas exchange areas but fills the respiratory passages where exchange of gases does not occur. This air space is called dead space. Dead space is not involved in gaseous exchange. It amounts to approximately 150mL.