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Chapter 39: Q.20 (page 1147)

How can a decrease in the percent of oxygen in the air affect the movement of oxygen in the body?

Short Answer

Expert verified

If the amount of oxygen drops in the inspired air, there would be reduced partial pressure.

Step by step solution

01

Step 1. Introduction

  • The lungs can hold a large volume of air, but they are not usually filled to maximal capacity.
  • Lung volume measurements include tidal volume, expiratory reserve volume, inspiratory reserve volume, and residual volume. The sum of these equals the total lung capacity.
02

Step 2. Explanation

  • Oxygen moves from the lung to the bloodstream to the tissues according to the pressure gradient. This is measured as the partial pressure of oxygen.
  • If the amount of oxygen drops in the inspired air, there would be reduced partial pressure. This would decrease the driving force that moves the oxygen into the blood and into the tissues. PO2 is also reduced at high elevations:PO2 at high elevations is lower than at sea level because the total atmospheric pressure is less than atmospheric pressure at sea level.

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Most popular questions from this chapter

When someone is standing, gravity stretches the bottom of the lung down toward the floor to a greater extent than the top of the lung. What implication could this have on the flow of air in the lungs? Where does gas exchange occur in the lungs?

Alveolar ventilation remains constant when ________.

a. the respiratory rate is increased while the volume of air per breath is decreased

b. the respiratory rate and the volume of air per breath are increased

c. the respiratory rate is decreased while increasing the volume per breath

d. both a and c

Which of the following statements about the mammalian respiratory system is false?

a. When we breathe in, air travels from the pharynx to the trachea.

b. The bronchioles branch into bronchi.

c. Alveolar ducts connect to alveolar sacs.

d. Gas exchange between the lung and blood takes place in the alveolus.

How would increased airway resistance affect intrapleural pressure during inhalation?

The total lung capacity is calculated using which of the following formulas?

a. residual volume + tidal volume + inspiratory reserve volume

b. residual volume + expiratory reserve volume + inspiratory reserve volume

c. expiratory reserve volume + tidal volume + inspiratory reserve volume

d. residual volume + expiratory reserve volume + tidal volume + inspiratory reserve volume
See all solutions

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