Question 1

Which dissolved gas cannot be transported by hemoglobin?

Accepted Answer

A)  nitric acid (NO) 
B)  oxygen (O2) 
C)  carbon dioxide (CO2) 
D)  carbon monoxide (CO) 
E)  nitrogen (N2) F) A) and E)
G) B) and D)

Question 2

In which PO2 environment would hemoglobin most easily release its O2?

Accepted Answer

A)  40 mm Hg
B)  65 mm Hg
C)  75 mm Hg
D)  90 mm Hg
E)  100 mm HgF) A) and E)
G) A) and B)

Question 3

The many lamellae in the gills of fish improve respiratory efficiency by ________.

Accepted Answer

A)  decreasing the distance for diffusion
B)  increasing the surface area for diffusion
C)  increasing the concentration difference
D)  changing the diffusion constantE) None of the above
F) A) and B)

Question 4

In the countercurrent exchange in a fish's gills,the oxygen concentration is always ________ in the water than the blood along the entire pathway of each lamella.

Accepted Answer

A)  higher
B)  lower
C)  the sameD) All of the above
E) B) and C)

Question 5

The gas exchange surfaces in a mammalian lung are organized into structures that look like clusters of hollow grapes.The hollow,grape-like structures are the________.

Accepted Answer

A)  spiracles
B)  lamellae
C)  alveoli
D)  papulae
E)  bronchiF) B) and E)
G) A) and E) C

Question 6

During exercise,the blood returning to a person's heart contains hemoglobin that is about ________ saturated.

Accepted Answer

A)  3%
B)  22%
C)  35%
D)  75%
E)  97%F) D) and E)
G) All of the above

Question 7

What change would increase the rate of oxygen diffusing from lung alveoli into the blood?

Accepted Answer

A)  An increase in the hemoglobin concentration of the red blood cells
B)  A decrease in the partial pressure of oxygen in the alveoli
C)  An increase in the partial pressure of oxygen in the blood entering the lungs
D)  A decrease in the pH of the blood entering the lungs
E)  An increase in the humidity of air in the lungsF) B) and E)
G) A) and B)

Question 8

The most efficient lungs with respect to oxygen uptake are found in this group of vertebrates.

Accepted Answer

A)  amphibians
B)  birds
C)  fish
D)  mammals
E)  reptilesF) B) and E)
G) A) and C)

Question 9

Ciliated gills in clams,sharks continuously swimming with their mouths partly open,countercurrent flow of blood and water in fish gills,and the use of air sacs to effect unidirectional flow of air through bird lungs are all adaptations that optimize what factor in the formula for Fick's Law of diffusion?

Accepted Answer

A)  D
B)  Δp
C)  d
D)  AE) A) and B)
F) A) and C) B

Question 10

During exhalation,the diaphragm ________.

Accepted Answer

A)  contracts and moves down
B)  relaxes and moves up
C)  relaxes and moves down
D)  contracts and moves upE) A) and B)
F) A) and C) B

Question 11

The primary advantage of gills versus the body surface for gas exchange in aquatic animals is that ________.

Accepted Answer

A)  gills are located near the mouth
B)  all gills contain a countercurrent exchange system
C)  gills have a much greater diffusion surface area
D)  gills decrease resistance to movementE) B) and C)
F) None of the above

Question 12

What would a graph of internal lung pressure compared to atmospheric pressure look like during one inhalation/exhalation cycle in a frog?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  EF) None of the above
G) B) and D)

Question 13

Each breath is initiated by neurons in the "respiratory control center" located in the

Accepted Answer

A)  spinal cord.
B)  larynx.
C)  cerebellum.
D)  medulla oblongata.
E)  carotid body.F) A) and E)
G) B) and E)

Question 14

The oxygen content of dry air in the atmosphere

Accepted Answer

A)  is about 78.1%.
B)  is about 21.0%.
C)  is about 0.03%.
D)  varies depending on the altitude.
E)  is inversely proportional to the partial pressure of oxygen.F) A) and B)
G) B) and E)

Question 15

Which of these animals uses positive pressure breathing?

Accepted Answer

A)  amphibians
B)  reptiles
C)  birds
D)  mammalsE) A) and C)
F) A) and B)

Question 16

The close proximity of capillaries to the alveoli in lungs improve respiratory efficiency by ________.

Accepted Answer

A)  decreasing the distance for diffusion
B)  increasing the surface area for diffusion
C)  increasing the concentration difference
D)  changing the diffusion constantE) B) and D)
F) B) and C)

Question 17

Ram ventilation is used by ________ during respiration.

Accepted Answer

A)  frogs
B)  tuna
C)  whales
D)  penguins
E)  salamandersF) None of the above
G) A) and D)

Question 18

In tissue capillaries,________ combines with water to form carbonic acid,which after being transported to the lungs,dissociates back to its constituents.

Accepted Answer

A)  CO2
B)  O2
C)  H2CO3
D)  hemoglobin
E)  HCO3-F) A) and E)
G) A) and D)

Question 19

Which group of animals has one-way flow of air through its lungs,whereas all the others have tidal flow?

Accepted Answer

A)  birds
B)  amphibians
C)  mammals
D)  reptilesE) None of the above
F) B) and C)

Question 20

The axolotl,an aquatic amphibian,uses ________ for gas exchange.

Accepted Answer

A)  internal gills
B)  external gills
C)  lungs
D)  tracheal tubes
E)  papulaeF) A) and D)
G) C) and D)

Exam 47: The Respiratory System

Which dissolved gas cannot be transported by hemoglobin?

Correct Answer
verified

In which P_O2 environment would hemoglobin most easily release its O₂?

Correct Answer
verified

The many lamellae in the gills of fish improve respiratory efficiency by ________.

Correct Answer
verified

In the countercurrent exchange in a fish's gills,the oxygen concentration is always ________ in the water than the blood along the entire pathway of each lamella.

Correct Answer
verified

The gas exchange surfaces in a mammalian lung are organized into structures that look like clusters of hollow grapes.The hollow,grape-like structures are the________.

Correct Answer
verified
C

During exercise,the blood returning to a person's heart contains hemoglobin that is about ________ saturated.

Correct Answer
verified

What change would increase the rate of oxygen diffusing from lung alveoli into the blood?

Correct Answer
verified

The most efficient lungs with respect to oxygen uptake are found in this group of vertebrates.

Correct Answer
verified

Correct Answer
verified
B

During exhalation,the diaphragm ________.

Correct Answer
verified
B

The primary advantage of gills versus the body surface for gas exchange in aquatic animals is that ________.

Correct Answer
verified

What would a graph of internal lung pressure compared to atmospheric pressure look like during one inhalation/exhalation cycle in a frog?

Correct Answer
verified

Each breath is initiated by neurons in the "respiratory control center" located in the

Correct Answer
verified

The oxygen content of dry air in the atmosphere

Correct Answer
verified

Which of these animals uses positive pressure breathing?

Correct Answer
verified

The close proximity of capillaries to the alveoli in lungs improve respiratory efficiency by ________.

Correct Answer
verified

Ram ventilation is used by ________ during respiration.

Correct Answer
verified

In tissue capillaries,________ combines with water to form carbonic acid,which after being transported to the lungs,dissociates back to its constituents.

Correct Answer
verified

Which group of animals has one-way flow of air through its lungs,whereas all the others have tidal flow?

Correct Answer
verified

The axolotl,an aquatic amphibian,uses ________ for gas exchange.

Correct Answer
verified

Exam 47: The Respiratory System

Which dissolved gas cannot be transported by hemoglobin?

Correct AnswerverifiedShow Answer

In which PO2 environment would hemoglobin most easily release its O2?

Correct AnswerverifiedShow Answer

The many lamellae in the gills of fish improve respiratory efficiency by ________.

Correct AnswerverifiedShow Answer

In the countercurrent exchange in a fish's gills,the oxygen concentration is always ________ in the water than the blood along the entire pathway of each lamella.

Correct AnswerverifiedShow Answer

The gas exchange surfaces in a mammalian lung are organized into structures that look like clusters of hollow grapes.The hollow,grape-like structures are the________.

Correct AnswerverifiedC

During exercise,the blood returning to a person's heart contains hemoglobin that is about ________ saturated.

Correct AnswerverifiedShow Answer

What change would increase the rate of oxygen diffusing from lung alveoli into the blood?

Correct AnswerverifiedShow Answer

The most efficient lungs with respect to oxygen uptake are found in this group of vertebrates.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedB

During exhalation,the diaphragm ________.

Correct AnswerverifiedB

The primary advantage of gills versus the body surface for gas exchange in aquatic animals is that ________.

Correct AnswerverifiedShow Answer

What would a graph of internal lung pressure compared to atmospheric pressure look like during one inhalation/exhalation cycle in a frog?

Correct AnswerverifiedShow Answer

Each breath is initiated by neurons in the "respiratory control center" located in the

Correct AnswerverifiedShow Answer

The oxygen content of dry air in the atmosphere

Correct AnswerverifiedShow Answer

Which of these animals uses positive pressure breathing?

Correct AnswerverifiedShow Answer

The close proximity of capillaries to the alveoli in lungs improve respiratory efficiency by ________.

Correct AnswerverifiedShow Answer

Ram ventilation is used by ________ during respiration.

Correct AnswerverifiedShow Answer

In tissue capillaries,________ combines with water to form carbonic acid,which after being transported to the lungs,dissociates back to its constituents.

Correct AnswerverifiedShow Answer

Which group of animals has one-way flow of air through its lungs,whereas all the others have tidal flow?

Correct AnswerverifiedShow Answer

The axolotl,an aquatic amphibian,uses ________ for gas exchange.

Correct AnswerverifiedShow Answer

Correct Answer
verified

In which P_O2 environment would hemoglobin most easily release its O₂?

Correct Answer
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C

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B

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B

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