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Exchange of gases in human lungs and tissues

The atmospheric air contains

  • Oxygen – 20.9 %

  • Carbon dioxide – 0.04 %

  • Nitrogen and other inert gases – 79 %

  • Water Vapors – variable

The air reaches to the alveoli of the lungs. Exchange of gases in the lungs occurs between the blood of the blood capillaries and the air of the alveoli of the lungs.

The basic properties involved in gas exchange are

  • Gases always diffuse from the

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Regulation of Respiration (control of respiration)

Regulation of ventilation

The main aim of regulation/control is to maintain level of oxygen and carbon dioxide within normal limits, during rest as well during various activities. Spontaneous respiration is controlled by

  1. Nervous regulation

  2. Chemical regulation

The Nervous regulation the neurons for this type of regulation are present in

  • Medulla; there are two groups of neurons to form

  • Inspiratory centre or dorsal medullary centre (DRG). It is present in dorsomedial

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