Question

question 12
1 pts
the tendency of the thorax and lungs to return to the preinspiration volume is called:
compliance.
elastic recoil.
expiration.
ventilation.
question 13
1 pts
the approximate partial pressure of oxygen at standard atmospheric pressure is about____mm hg.
23
160
300
590
question 14
1 pts
the term used to describe the volume of air exchanged during normal inspiration and expiration is:
inspiratory and expiratory reserve volume.
vital capacity.
tidal volume.
residual volume.

Explanation:

• Question 12: Elastic recoil is the tendency of the thorax and lungs to return to their pre - inspiration volume. Compliance is the ability of the lungs and thorax to expand. Expiration is the process of breathing out. Ventilation is the overall process of air movement in and out of the lungs.
• Question 13: The standard atmospheric pressure is about 760 mm Hg. Oxygen makes up approximately 21% of the atmosphere. Using Dalton's law (\(P_{O_2}=0.21\times760\)), \(P_{O_2}\approx160\) mm Hg.
• Question 14: Tidal volume is the volume of air exchanged during normal inspiration and expiration. Inspiratory and expiratory reserve volumes are additional air that can be inhaled or exhaled beyond the tidal volume. Vital capacity is the maximum amount of air that can be exhaled after a maximum inhalation. Residual volume is the air that remains in the lungs after maximum exhalation.

Answer:

• Question 12: elastic recoil
• Question 13: 160
• Question 14: tidal volume