Question:

What is vital capacity of our lungs?

Updated On: May 11, 2024
  • Inspiratory reserve volume plus tidal volume
  • Total lung capacity minus expiratory reserve volume
  • Inspiratory reserve volume plus expiratory reserve volume
  • Total lung capacity minus residual volume
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The Correct Option is D

Solution and Explanation

Vital capacity of lungs is the largest possible expiration after largest possible inspiration that is greatest. Volume of air can be exchanged in single respiration or amount of air breathed in and out with greatest possible efforts.

Vital capacity = TV + IRV + ERV
Total lung capacity = VC + RV
So we can say that VC = Total lung capacity - Residual volume
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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.

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