residual volume

physiology

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In respiratory system: Respiratory organs of vertebrates
…effort, however, there remains a residual volume of approximately 1,200 millilitres. By the same token, at the end of a normal inspiration, further effort may succeed in drawing into the lungs an additional 3,000 millilitres.
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In human respiratory system: The role of muscles
…circumstances is known as the residual volume; it is about 20 percent of the volume at the end of full inspiration (known as the total lung capacity). Additional collapse of the lung to its “minimal air” can be accomplished only by opening the chest wall and creating a pneumothorax.
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