Which of the following statements are true of the respiratory muscles and pressure changes during breathing (Select all that apply) ?
A) Atmospheric pressure is a constant that depends on a person's elevation above sea level.
B) Contraction of the diaphragm increases the size of the chest cavity from top to bottom.
C) The external intercostal muscles are used only for a forced inhalation.
D) The normal elasticity of the lungs is important for normal exhalation.
E) The diaphragm is smooth muscle that contracts only as part of the breathing reflex.
F) A normal inhalation is active,but a normal exhalation is passive.
Correct Answer:
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