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Which of the following events is not involved in expiration?
Option: 1
Relaxation of external intercostal muscles
Option: 2
Relaxation of diaphragm
Option: 3
Decrease in volume of thorax cavity
Option: 4
Decrease in pressure in alveoli
Answers (1)
Mechanism of Breathing: Expiration -
The process of expiration
Hence, the correct option is D.
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