1. Ravi Ranjan
  2. Life Processes
  3. Friday, June 17 2016, 01:24 PM
Explain the process by which inhalation occurs during breathing in human beings.
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Inhalation or inspiration is the process by which air is brought into the lungs during breathing in human beings.

It involves the following steps:
(i) The external intercostals muscles contract causing ribs to pull out and chest cavity to expand.
(ii) Diaphragm contracts and is brought down a little. This also expands the chest cavity.
(iii) There is a contraction of a abdominal muscles. The expansion of the chest cavity creates a partial vacuum and atmospheric air rushes the lung.
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