Question:

Among the following the partial pressure of oxygen is maximum in

Updated On: Jul 6, 2022
  • alveolar air
  • arterial blood
  • venous blood
  • expired air
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The Correct Option is D

Solution and Explanation

The partial pressure of oxygen in maximum in the expired air (116 mm Hg) because during expiration the oxygen that could not be inhaled also moves out, contributing to more partial pressure in exhaled air. A. Alveolar air has 104 mm Hg of partial pressure of oxygen. B. Arterial blood has 95 mm Hg partial pressure of oxygen. C. Venous blood has 40 mm Hg partial pressure of oxygen. D. Expired air has 116 mm Hg partial pressure of oxygen. So, the correct answer is 'Expired air'
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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