Final answer:
Normal Inspiration in breathing involves the elastic recoil of tissues and surface tension, facilitated by the actions of the diaphragm and intercostal muscles.
Explanation:
Normal Inspiration occurs due to a combination of the elastic recoil of tissues and surface tension. During normal breathing, the diaphragm contracts and the external intercostal muscles are involved in the process of inhalation, expanding the thoracic cavity and decreasing air pressure to allow air to rush into the lungs. On the other hand, the relaxation of these muscles facilitates normal expiration, where the lung tissue elasticity and pressure changes help air to leave the lungs passively.
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