Question 1

Use the following key to determine the best answer.
-(1)  PO2 in alveolar air
(2)  PO2 in venous blood

Accepted Answer

A)  First item is greater than the second item.
B)  First item is less than the second item.
C)  First item is equal or nearly equal to the second item.D) A) and C)
E) All of the above

Question 2

Which of the following situations would decrease the oxygenation of fetal blood?

Accepted Answer

A)   A decrease in fetal hemoglobin
B)   A decrease in maternal hemoglobin
C)   An increase in fetal hemoglobin
D)   A decrease in binding affinity of maternal hemoglobinE) C) and D)
F) B) and C)

Question 3

Which of the following functions is associated with the nose?

Accepted Answer

A)   Initiating the cough reflex
B)   Systemic respiration
C)   Warming inhaled air
D)   Producing mucus to trap debris from the air
E)   Both "Warming inhaled air" and "Producing mucus to trap debris from the air" are correct.F) A) and E)
G) B) and D)

Question 4

The respiratory zone of the tracheobronchial tree includes which of the following?

Accepted Answer

A)   Trachea
B)   Alveoli
C)   Primary bronchi
D)   Larynx
E)   Tertiary bronchiF) All of the above
G) B) and E)

Question 5

Expiration during quiet breathing

Accepted Answer

A)   is an active process.
B)   requires more muscle contractions than inspiration.
C)   is due to contraction of the diaphragm and elevation of the ribs.
D)   occurs when the diaphragm and external intercostal muscles relax.
E)   is not affected by the elastic properties of the lungs.F) B) and D)
G) A) and D)

Question 6

Which of the following is NOT a factor that influences the rate of gas diffusion through the respiratory membrane?

Accepted Answer

A)   The partial pressure gradient of the gases
B)   The thickness of the respiratory membrane
C)   The diffusion coefficient of the gases
D)   The temperature of the gases
E)   The surface area of the membraneF) A) and C)
G) C) and D)

Question 7

Which of the following statements concerning thoracic volume is true?

Accepted Answer

A)   As thoracic volume increases, alveolar pressure (Palv)  increases.
B)   In expiration, the thoracic volume increases.
C)   Constriction of bronchioles assists breathing.
D)   As alveolar volume increases, alveolar pressure (Palv)  decreases.
E)   Pressure is directly proportional to volume.F) B) and E)
G) All of the above

Question 8

The chemosensitive area of the brain is located in the ________.

Accepted Answer

A)   pons
B)   cerebral peduncles
C)   cerebellum
D)   hypothalamus
E)   medulla oblongataF) All of the above
G) A) and C)

Question 9

Which of the following molecules acts as a buffer during the chloride shift?

Accepted Answer

A)   CO2
B)   Hemoglobin
C)   Carbonic anhydrase
D)   Water
E)   Bicarbonate ionF) B) and E)
G) B) and C)

Question 10

Which of the following muscles increases the volume of the thorax during a normal inhalation?
(1)  Diaphragm
(2)  External intercostals
(3)  Internal intercostals
(4)  Rectus abdominis

Accepted Answer

A)   1, 2
B)   1, 3
C)   2, 3
D)   2, 4
E)   3, 4F) A) and C)
G) A) and B)

Question 11

When the inspiratory muscles contract,

Accepted Answer

A)   thoracic volume increases.
B)   pleural pressure increases.
C)   the alveolar pressure increases.
D)   expiration occurs.
E)   thoracic volume decreases.F) B) and C)
G) None of the above

Question 12

Surfactant facilitates alveolar ventilation by

Accepted Answer

A)   decreasing the surface tension between water molecules on the lining of the alveoli.
B)   decreasing thoracic compliance.
C)   attracting water to the alveolar surface.
D)   increasing the surface area for gas exchange.
E)   increasing the surface tension between fluid and the alveoli.F) A) and E)
G) A) and D)

Question 13

With a respiratory rate of 12 breaths per minute and a tidal volume of 500mL, what would the minute ventilation be?

Accepted Answer

A)   500 mL per minute
B)   41.6 mL per minute
C)   600 mL per minute
D)   60 liters per minute
E)   6 liters per minuteF) B) and C)
G) A) and B)

Question 14

Match the term with the appropriate description. Answer with the letter preceding the description.
-Nasopharynx

Accepted Answer

A)  The floor of the nasal cavity
B)  Superior portion of pharynx
C)  A soft process that extends inferiorly from the posterior edge of the soft palate
D)  The opening of the nasal cavity into the pharynx
E)  External openings of the nasal cavityF) All of the above
G) B) and E)

Question 15

Whenever people cry, their nose runs. This is because the ________ drain tears into the nose.

Accepted Answer

A)   nasolacrimal ducts
B)   paranasal sinuses
C)   lacrimal glands
D)   Wharton's ducts
E)   auditory tubeF) A) and D)
G) A) and E)

Question 16

Match the term with the appropriate description. Answer with the letter preceding the description.
-External nares

Accepted Answer

A)  The floor of the nasal cavity
B)  Superior portion of pharynx
C)  A soft process that extends inferiorly from the posterior edge of the soft palate
D)  The opening of the nasal cavity into the pharynx
E)  External openings of the nasal cavityF) C) and D)
G) B) and C)

Question 17

Which of the following structures opens directly into the nasal cavity?

Accepted Answer

A)   Paranasal sinuses
B)   Auditory tubes
C)   Lacrimal glands
D)   Fauces
E)   EpiglottisF) A) and B)
G) B) and C)

Question 18

During expiration, the alveolar pressure must be

Accepted Answer

A)   greater than atmospheric pressure.
B)   less than atmospheric pressure.
C)   equal to atmospheric pressure.
D)   greater than pleural pressure.
E)   None of these choices is correct.F) A) and B)
G) A) and C)

Question 19

The portion of the pharynx that extends from the internal nares to the level of the uvula is the ________.

Accepted Answer

A)   glottis
B)   nasopharynx
C)   oropharynx
D)   laryngopharynx
E)   glottopharynxF) All of the above
G) B) and C)

Question 20

Match the disorder of the respiratory system with the best description.
-Decrease in body temperature

Accepted Answer

A)  Destruction of the alveolar walls
B)  Inflammation of the bronchi
C)  Inherited disease that affects secretory cells lining the lungs
D)  Replacement of lung tissue with fibrous connective tissue
E)  Infant stops breathing during sleepF) C) and D)
G) A) and B)

Exam 23: Respiratory System

The respiratory zone of the tracheobronchial tree includes which of the following?

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Which of the following structures opens directly into the nasal cavity?

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Which of the following situations would decrease the oxygenation of fetal blood?

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Match the term with the appropriate description. Answer with the letter preceding the description. -Nasopharynx

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Which of the following functions is associated with the nose?

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Which of the following molecules acts as a buffer during the chloride shift?

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The chemosensitive area of the brain is located in the ________.

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Which of the following is NOT a factor that influences the rate of gas diffusion through the respiratory membrane?

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With a respiratory rate of 12 breaths per minute and a tidal volume of 500mL, what would the minute ventilation be?

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The portion of the pharynx that extends from the internal nares to the level of the uvula is the ________.

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Expiration during quiet breathing

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Match the disorder of the respiratory system with the best description. -Decrease in body temperature

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Whenever people cry, their nose runs. This is because the ________ drain tears into the nose.

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Surfactant facilitates alveolar ventilation by

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When the inspiratory muscles contract,

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Match the term with the appropriate description. Answer with the letter preceding the description. -External nares

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Which of the following statements concerning thoracic volume is true?

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Use the following key to determine the best answer. -(1) PO2 in alveolar air (2) PO2 in venous blood

Correct AnswerverifiedShow Answer

During expiration, the alveolar pressure must be

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Which of the following muscles increases the volume of the thorax during a normal inhalation? (1) Diaphragm (2) External intercostals (3) Internal intercostals (4) Rectus abdominis

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Use the following key to determine the best answer. -(1) PO₂ in alveolar air (2) PO₂ in venous blood

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