Question

How are inspiration and expiration brought about in human beings?

Answer 1

Inspiration and expiration are part of the breathing process in humans. The process of respiration involves two major processes: inspiration and expiration. During inspiration, the inspiratory muscles contract, the diaphragm descends, and the rib cage rises
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Answer 2

During expiration

The diaphragm relaxes and the volume of the thoracic cavity decreases while the pressure within it increases.

During ispiration

The diaphragm contracts and pulls downward while the muscles between the ribs contract and pull upward.