Oxygen and carbon dioxide are exchanged with blood directly across the alveoli wall.
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Q20: During exhalation, the pressure inside the lungs
A)
Q21: Which one of the following is a
Q22: Oxygen-rich blood flows through the heart
A) by
Q23: The rate and depth of normal breathing
Q24: Which of the following results from the
Q26: The trachea is completely surrounded by rings
Q27: Oxygen moves from the lungs into the
Q28: A condition in which wheezing occurs with
Q29: In which one of the following situations
Q30: The respiratory control center is located
A) in
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