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Gas Exchange

Interactive Physiology® Quiz: Gas Exchange

This activity contains 50 questions.

Question 1
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Gas exchange occurs
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Question 2
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Pressure units are expressed in millimeters of mercury.

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Question 3
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At sea level, PO2
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Question 4
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The most abundant gas in the earth's atmosphere is
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Question 5
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Dalton's Law of Partial Pressure states that, when the partial pressures of atmospheric gasses are added together, the sum will equal
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Question 6
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On the planet Vonetta, the atmospheric pressure is 600 mm Hg. Ten percent of its atmospheric gas is carbon dioxide. What is the partial pressure of carbon dioxide?
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Question 7
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Question 8
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At higher altitudes the percent of atmospheric gases decreases.

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Question 9
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Lower atmospheric pressure
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Question 10
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Question 11
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Within the lungs carbon dioxide and oxygen diffuse between the air in the alveoli and the blood.

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Question 12
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When oxygen and carbon dioxide are placed in a pressurized container, both gases will dissolve equally into the solution.

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Question 13
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Which atmospheric gas is the most soluble in liquid?
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Question 14
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If oxygen and water are placed into a container and allowed to go to equilibrium, the pressure of oxygen above the water will be _____ the pressure of oxygen in the water.
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Question 15
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If oxygen and water are at equilibrium and pressure is applied to the container,
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Question 16
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Question 17
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Internal and external respiration occur in exactly the same regions of the body.

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Question 18
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All of the following are factors in external respiration EXCEPT
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Question 19
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Which situation would interfere with external respiration?
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Question 20
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There are approximately 300 million alveoli in both lungs.

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Question 21
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Which statement is INCORRECT?
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Question 22
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The partial pressure of oxygen within the alveolus is _____ that of atmospheric air.
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Question 23
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A PO2 of 40 mm Hg is found in
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Question 24
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Which statement is CORRECT?
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Question 25
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The PCO2 in the blood leaving the lung is identical to alveolar PCO2.

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Question 26
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The partial pressure of carbon dioxide within the alveolus is _____ atmospheric air.
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Question 27
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PCO2is highest in
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Question 28
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Question 29
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Carbon dioxide is less soluble than oxygen so it requires a steeper partial pressure gradient for diffusion to occur.

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Question 30
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Equilibrium between PO2 in the alveolus and pulmonary capillary occurs within the first third of the capillary.

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Question 31
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Which statement is TRUE?
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Question 32
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The partial pressure of oxygen within the alveolus is
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Question 33
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Match each gas law to its correct definition.

Using the pull-down menus, match each item in the left column to the corresponding item in the right column.
A The amount of gas that dissolves in a liquid is proportional to the partial pressure and solubility of a gas.
B The pressure of a gas is inversely proportional to the volume of its container.
C In a mixture of gases, the total pressure equals the sum of partial pressures exerted by each gas.
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Question 34
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Each alveolus continuously receives the same blood flow.

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Question 35
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Ventilation-perfusion coupling involves maintaining airflow that is proportional to the pulmonary capillary flow.

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Question 36
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A restriction to airflow such as mucus in the bronchioles
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Question 37
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What will stimulate arteriole vasodilation in the pulmonary circulation?
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Question 38
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The partial pressure of oxygen within the alveolus regulates blood flow, while the partial pressure of carbon dioxide regulates alveolar airflow.

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Question 39
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Which situation will stimulate constriction of a bronchiole?
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Question 40
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When ventilation is low, the alveoli PCO2 is higher than normal and PO2 is lower than normal.

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Question 41
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Lower PO2 within the alveolus will trigger bronchiole dilation.

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Question 42
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A person with bronchial pneumonia has bronchioles that are filled with pus and mucus. Predict the most probable reaction to this condition.
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Question 43
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Question 44
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Cells require oxygen for cellular respiration.

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Question 45
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The rate of blood flow to a tissue would increase during times of high metabolic activity.

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Question 46
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The PO2 of blood leaving a tissue is greater than the PCO2.

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Question 47
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Which factor affects internal respiration?
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Question 48
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If the PCO2 in the tissue spaces is greater than the PCO2 within the systemic capillary,
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Question 49
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Which blood PCO2 would you expect to find leaving the tissue?
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Question 50
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When a tissue is metabolically active,
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