________ is a substance secreted by cells in the lungs that reduces surface tension.
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Q33: Which of the following is a value
Q34: The additional volume of air that can
Q35: The respiratory membrane consists of
A) a single
Q36: Gas exchange between the air in the
Q37: The force responsible for normal resting expiration
Q39: The volume of air that can be
Q40: The condition in which outside air enters
Q43: The respiratory centers are located in the
Q57: Within a mixture of gases, the pressure
Q81: A voluntary increase in the rate and
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