Which of the Following Must Occur for Air to Enter

question 73

Multiple Choice

Which of the following must occur for air to enter the lungs during inhalation (inspiration) ?

• A) The principal muscles of inhalation (inspiration) contract.
• B) The volume of the lungs increase.
• C) The pressure in the lungs falls below atmospheric pressure.
• D) all of these choices.

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Definitions:

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