Exchange Of Gases

Answer (a) 40 mm of Hg

The upward and downward movement of the shaft of the rib no 6 - 10 has been likened to raising the handle from the side of a bucket. Therefore, they show bucket handle movement

The maximum amount of air which can be breathed out through forceful expiration after a forceful inspiration is called Vital Capacity (VC). It is sum total of Tidal Volume (TV), Inspiratory Reserve Volume (IRV) and Expiratory Reserve Volume (ERV). The value for vital capacity is about 3.4 - 4.8 litres.

The volume of air .from nostril to terminal bronchiole which is not taking part in exchange of gases is known as anatomical dead space. Normally, the volume of anatomical dead space air is about .

In oxygenated and deoxygenated blood the quantity of oxygen is approx 20 ml and 15 ml per 100 ml of blood and the level of is 48 ml and 52 ml per 100 ml of blood respectively.