On what does the movement of gases between the lungs and the body tissues mainly depend?

On what does the movement of gases between the lungs and the body tissues mainly depend?
 
  a. Active transport
  b. Gaseous diffusion
  c. Membrane dialysis
  d. Membrane transport

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Q. 2  What is used for setting optimal PEEP on a ventilator?
 
  a. Pressure-volume curve
  b. Flow-volume curve
  c. Patient's height and weight
  d. The disease state the patient is in

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Q. 3  Where is Raw highest in the airway of the human body?
 
  a. Terminal bronchioles
  b. Carina
  c. Left lower lobe
  d. Nose, mouth, and large airways

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Q. 4  Which of the following causes gas to flow into and out of the alveoli during breathing?
 
  a. Transrespiratory system pressure (PTR)
  b. Intrapleural pressure (Ppl)
  c. Transpulmonary pressure (PTP)
  d. Transmural pressure (Ptm)