Question:

After forceful inspiration, the amount of air that can be breathed out by maximum forced expiration is equal to

Updated On: Jun 17, 2022
  • Inspiratory Reserve Volume (IRV) + Expiratory Reserve Volume (ERV) + Tidal Volume (TV) + Residual Volume (RV)
  • IRV + RV + ERV
  • IRV + TV + ERV
  • TV + RV + ERV
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The Correct Option is C

Solution and Explanation

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.
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Concepts Used:

Breathing and Exchange of Gases

A metabolic process, which is carried out by all living organisms including plants, animals, and humans for the production of energy and to stay alive is Respiration.  Except for required anaerobes, every other organism from amoeba to humans needs oxygen for survival. And evolution has reported a number of systems that allows the exchange of gases in organisms.

There are two types of respiration such as;

  1. Aerobic respiration — to produce energy, it occurs in the presence of oxygen
  2. Anaerobic respiration — to produce energy, occurs in the absence of oxygen

Breathing can be simply derived as the process of inhaling oxygen gas from the atmosphere and exhaling the carbon dioxide gas back into the atmosphere is termed breathing and the process is commonly known as respiration.

Read More: Breathing and Exchange of Gases