What is the first step in respiration?

What is the first step in respiration?
  1. Exchange of oxygen and carbon dioxide between deoxygenated blood and alveoli
  2. Transport of gases throughout the body by blood
  3. Exchange of oxygen and carbon dioxide between oxygenated blood and tissues
  4. Breathing

Solution

The first step in respiration is breathing by which atmospheric air is taken in (inspiration) and the alveolar air is released out (expiration).

Asked in: NCERT

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