Question

The volume of air inspired or expired by a healthy man per minute is
A. 1000 ml - 1100 ml
B. 2500 ml-3000 ml
C. 6000m1-8000ml
D. 400 ml - 500 ml

Answer 1

Hint: The volume of air that is expired or inspired by a human is dependent upon his/her body mass. This volume of air is expired or inspired without the development of any additional force.

Complete answer: The volume of air inspired or expired by a normal man without the application of additional force is known as the tidal volume.
1. This volume ranges from around 400ml-500ml and is the volume of air that is expired or inspired per minute.
2. When additional force is applied for inhalation and exhalation, they are known as inspiratory reserve volume and expiratory reserve volume respectively.
3. Together the inspiratory reserve volume and the expiratory reserve volume along with the tidal volume form the inspiratory and expiratory capacity respectively.
4. Once the expiration occurs then the amount of air that remains left in the lung is known as the residual volume which is around 1000ml.

Hence, the correct option is (D), 400ml-500ml.

Note: Capacities are a sum of more than one volume like inspiration capacity is the sum of inspiratory reserve volume and the tidal volume.