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.
Super User Accepted Answer Pending Moderation
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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