Question 1

The composition of alveolar air differs from atmospheric air. Indicate all of the factors that account for this difference.

Accepted Answer

A)   Nitrogen does not enter alveoli
B)   Difference in overall (total)  pressure
C)   Presence of water vapor
D)   Gas exchange adds CO2
E)   Gas exchange removes O2F) A) and B)
G) A) and C)

Question 2

During exercise, the oxygen-hemoglobin dissociation curve

Accepted Answer

A)   shifts to the right.
B)   shifts to the left.
C)   doesn't shift.D) A) and B)
E) A) and C)

Question 3

In which of the following situations is compliance greatest?

Accepted Answer

A)   Collapse of the alveoli
B)   Airway obstruction
C)   Emphysema
D)   Pulmonary fibrosis
E)   Pulmonary edemaF) C) and D)
G) A) and B)

Question 4

The largest division of each lung are ________, which are divided into ________.

Accepted Answer

A)   lobules; segments
B)   segments; lobules
C)   lobes; lobules
D)   segments; lobes
E)   lobes; segmentsF) A) and B)
G) A) and C)

Question 5

Muscles of the thoracic wall are important for changing thoracic volume during expiration only.

Accepted Answer

A) True 
 B)False

Question 6

As the result of an asthmatic attack,

Accepted Answer

A)   ventilation exceeds the ability of blood to pick up oxygen.
B)   ventilation is inadequate to oxygenate blood.
C)   pulmonary blood flow is reduced while ventilation remains normal.
D)   the surface area available for gas exchange increases.
E)   bronchioles dilate.F) C) and E)
G) A) and B)

Question 7

The pontine respiratory neurons

Accepted Answer

A)   are located in the medulla oblongata in the brain.
B)   are active only during inspiration.
C)   are active only during expiration.
D)   play a role in switching between inspiration and expiration.
E)   is essential for respiratory rhythm.F) None of the above
G) A) and E)

Question 8

Pulmonary edema will cause the rate of gas diffusion to ________.

Accepted Answer

A)   increase
B)   decrease
C)   remain the sameD) All of the above
E) A) and B)

Question 9

Match the disorder of the respiratory system with the best description.
-Decrease in CO2

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) All of the above
G) A) and E)

Question 10

Apnea is the slowing of respiration as occurs during sleep.

Accepted Answer

A) True 
 B)False

Question 11

The highest level of exercise that can be performed without causing a significant change in blood pH is called the ________.

Accepted Answer

A)   Hering-Breuer reflex
B)   aerobic threshold
C)   anaerobic threshold
D)   lactate tolerance levelE) B) and C)
F) All of the above

Question 12

A baby holding its breath will

Accepted Answer

A)   be termed a "blue baby".
B)   have brain cells damaged because of low blood oxygen levels.
C)   suffer heart damage because of increased pressure in the aorta.
D)   automatically start to breathe when the CO2 levels in the blood reach a high enough value.
E)   automatically start to breathe when oxygen levels decrease slightly.F) A) and B)
G) A) and C)

Question 13

Match the disorder of the respiratory system with the best description.
-Increase in pH

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) A) and B)
G) A) and C)

Question 14

Normally, the partial pressure of oxygen gas is higher in the ________.

Accepted Answer

A)   blood of the pulmonary capillaries
B)   bronchioles
C)   alveoli
D)   venous bloodE) None of the above
F) All of the above

Question 15

Air in the pleural cavity is called

Accepted Answer

A)   emphysema.
B)   respiratory distress syndrome.
C)   a pneumothorax.
D)   pneumonia.
E)   forced expiration.F) B) and D)
G) A) and E)

Question 16

Why is the PO2 of the blood leaving pulmonary capillaries 104 mm Hg, but the blood leaving the lungs to enter the left atrium is 95 mm Hg?

Accepted Answer

A)   Some O2 diffuses out of the blood as it travels through the pulmonary veins.
B)   Some O2 is incorporated into bicarbonate ion, removing it from solution and reducing PO2.
C)   Some CO2 in the alveoli is mixed with oxygenated blood from alveolar circulation.
D)   Deoxygenated blood from bronchial circulation is mixed with blood from oxygenated alveolar circulation.E) All of the above
F) A) and B)

Question 17

Physiological dead air space is anatomic dead space plus

Accepted Answer

A)   the residual volume.
B)   the volume of any alveoli where gas exchange is diminished.
C)   the volume of blood flowing to the lungs.
D)   the respiration rate.
E)   tidal volume.F) C) and D)
G) C) and E)

Question 18

Hemoglobin that has released its O2

Accepted Answer

A)   loses its affinity for O2.
B)   will dissolve in the plasma.
C)   will bind more readily to CO2.
D)   is broken down to heme and globin and excreted.
E)   will bind more readily to O2.F) C) and E)
G) B) and E)

Question 19

Mr. Smith hypoventilates and retains too much CO2. Which of the following receptors is stimulated by an increase in CO2?

Accepted Answer

A)   Irritant receptors
B)   Pressure receptors
C)   Osmoreceptors
D)   Peripheral chemoreceptors
E)   BaroreceptorsF) All of the above
G) A) and B)

Question 20

Contraction of respiratory muscles are responsible for the movement of air out of the lungs in quiet expiration.

Accepted Answer

A) True 
 B)False

Exam 23: Respiratory System

Normally, the partial pressure of oxygen gas is higher in the ________.

Correct AnswerverifiedShow Answer

Apnea is the slowing of respiration as occurs during sleep.

Correct AnswerverifiedShow Answer

Pulmonary edema will cause the rate of gas diffusion to ________.

Correct AnswerverifiedShow Answer

Hemoglobin that has released its O2

Correct AnswerverifiedShow Answer

Air in the pleural cavity is called

Correct AnswerverifiedShow Answer

Match the disorder of the respiratory system with the best description. -Decrease in CO2

Correct AnswerverifiedShow Answer

The composition of alveolar air differs from atmospheric air. Indicate all of the factors that account for this difference.

Correct AnswerverifiedShow Answer

Why is the PO2 of the blood leaving pulmonary capillaries 104 mm Hg, but the blood leaving the lungs to enter the left atrium is 95 mm Hg?

Correct AnswerverifiedShow Answer

Contraction of respiratory muscles are responsible for the movement of air out of the lungs in quiet expiration.

Correct AnswerverifiedShow Answer

Physiological dead air space is anatomic dead space plus

Correct AnswerverifiedShow Answer

Muscles of the thoracic wall are important for changing thoracic volume during expiration only.

Correct AnswerverifiedShow Answer

The highest level of exercise that can be performed without causing a significant change in blood pH is called the ________.

Correct AnswerverifiedShow Answer

As the result of an asthmatic attack,

Correct AnswerverifiedShow Answer

A baby holding its breath will

Correct AnswerverifiedShow Answer

The largest division of each lung are ________, which are divided into ________.

Correct AnswerverifiedShow Answer

Match the disorder of the respiratory system with the best description. -Increase in pH

Correct AnswerverifiedShow Answer

During exercise, the oxygen-hemoglobin dissociation curve

Correct AnswerverifiedShow Answer

The pontine respiratory neurons

Correct AnswerverifiedShow Answer

Mr. Smith hypoventilates and retains too much CO2. Which of the following receptors is stimulated by an increase in CO2?

Correct AnswerverifiedShow Answer

In which of the following situations is compliance greatest?

Correct AnswerverifiedShow Answer

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Hemoglobin that has released its O₂

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Match the disorder of the respiratory system with the best description. -Decrease in CO₂

Correct Answer
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Why is the P_O2 of the blood leaving pulmonary capillaries 104 mm Hg, but the blood leaving the lungs to enter the left atrium is 95 mm Hg?

Correct Answer
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The largest division of each lung are , which are divided into .

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Mr. Smith hypoventilates and retains too much CO₂. Which of the following receptors is stimulated by an increase in CO₂?

Correct Answer
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Correct Answer
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