Which of the Following Statements Are True of the Respiratory

Multiple Choice

Which of the following statements are true of the respiratory muscles and pressure changes during breathing? (Read carefully and select all of the correct statements.)

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.