Respiratory Physiology Quiz

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Gas exchange & ventilation basics

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Shannon Irwin

United States

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Respiratory Physiology Quiz


Respiratory Physiology QuizOnline version Gas exchange & ventilation basics by Shannon Irwin 1 Why do the lungs stay inflated during inspiration and expiration? a Intrapulmonary pressure remains less than atmospheric pressure b Intrapleural pressure equals atmospheric pressure c Intrapleural pressure remains less than intrapulmonary pressure d Intrapulmonary pressure equals atmospheric pressure 2 Boyle's law states which relationship between pressure and volume? a Volume remains constant as pressure changes b P and V are directly proportional c P and V are inversely proportional d P remains constant as V changes 3 Alveolar gas exchange refers to the exchange of which gases? a Only CO2 exchange in alveolar air b O2 and N2 exchange in the alveoli c O2 and CO2 between alveolar air and pulmonary capillary blood d O2 exchange between alveolar air and tissues 4 What best defines systemic gas exchange? a O2 diffuses from tissues to blood only b CO2 diffuses from blood into tissues and O2 into blood c O2 diffuses from blood into tissues and CO2 diffuses from tissues into blood d CO2 diffuses from alveoli to blood 5 What percentage of oxygen is transported bound to hemoglobin? a 98% b 50% c 2% d 70% 6 In what form is 70% of CO2 carried in the blood? a Bicarbonate ion b Bound CO2 to proteins c Dissolved CO2 in plasma d Carbaminohemoglobin 7 What is the function of pulmonary surfactant? Choose one or more answers a Keeps alveoli inflated during inspiration b Filters air entering the alveoli c Increases surface tension to aid inflation d Accelerates gas diffusion across the membrane 8 What does anatomical dead space refer to? a Air in alveoli only b Air in conducting airways not participating in gas exchange c Alveolar air where gas exchange occurs d Air trapped in pleural cavity 9 What is pulmonary ventilation? a Diffusion of O2 and CO2 across membranes b Gas exchange between blood and tissues c Air exchange between alveoli and bloodstream only d Mechanical movement of air in and out of the lungs 10 Which vessels carry oxygenated blood to the left atrium? a Pulmonary veins b Pulmonary arteries c Systemic veins d Coronary veins 11 During expiration, intrapulmonary pressure must be __________ atmospheric pressure. a Greater than b Less than c Equal to d 12 During inspiration, intrapulmonary pressure must be __________ atmospheric pressure. a Greater than b Less than c Equal to 13 What drives the diffusion of gases? a Atmospheric pressure b Oxygen-hemoglobin saturation curve c Partial pressure gradient 14 What tool is used to measure respiratory volume? a Breathometer b Flowometer c Spirometer d 15 What structure allows the heart to sit in the mediastinum? a Cardiac impression b Cardiac notch c Left lobe d Oblique fissure 16 Which alveolar cells are responsible for gas exchange? a Alveolar macrophgaes b Alveolar type II cells c Alveolar type I cells 17 Total lung capacity increases as _______ a Alveolar surface area increases b Alveolar surface area decreases c Oxy-hemoglobin saturation increases d Alveolar ventilation increases 18 ______ of O2 travels in the blood dissolved in plasma. a 7-10% b 1% c 2% d 70% 19 ______ of CO2 travels in the blood dissolved in plasma. a 7-10% b 1% c 2% d 70% 20 Which of the following result in less O2 binding to CO2? a Increase in temperature b Increase in CO2 c Lower pH d All of the above 21 As PO2 increases, saturation of Hb increases a True b False 22 What is atmospheric pressure at sea level? a 460 mm Hg b 300 mm Hg c 760 mm Hg d 764 mm Hg Feedback 1 The negative intrapleural pressure keeps the lungs expanded, even as air moves in and out. 2 As pressure increases, volume decreases, and vice versa. 3 O2 diffuses into blood and CO2 diffuses into the alveoli during alveolar gas exchange. 4 Also called peripheral gas exchange; driving gradients are PO2 and PCO2. 5 Most oxygen is Hb-bound; a small portion is dissolved in plasma. 6 CO2 is mainly transported as bicarbonate after conversion in red blood cells. 7 Surfactant reduces surface tension, preventing collapse during breathing. 8 This air is not involved in gas exchange with blood. 9 Ventilation describes breathing mechanics, not diffusion. 10 Pulmonary veins return oxygen-rich blood from lungs to the heart.

Respiratory Physiology Quiz

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About this activity

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Respiratory Physiology QuizOnline version

by Shannon Irwin

Why do the lungs stay inflated during inspiration and expiration?

Boyle's law states which relationship between pressure and volume?

Alveolar gas exchange refers to the exchange of which gases?

What best defines systemic gas exchange?

What percentage of oxygen is transported bound to hemoglobin?

In what form is 70% of CO2 carried in the blood?

What is the function of pulmonary surfactant?

What does anatomical dead space refer to?

What is pulmonary ventilation?

Which vessels carry oxygenated blood to the left atrium?

During expiration, intrapulmonary pressure must be __________ atmospheric pressure.

During inspiration, intrapulmonary pressure must be __________ atmospheric pressure.

What drives the diffusion of gases?

What tool is used to measure respiratory volume?

What structure allows the heart to sit in the mediastinum?

Which alveolar cells are responsible for gas exchange?

Total lung capacity increases as _______

______ of O2 travels in the blood dissolved in plasma.

______ of CO2 travels in the blood dissolved in plasma.

Which of the following result in less O2 binding to CO2?

As PO2 increases, saturation of Hb increases

What is atmospheric pressure at sea level?