Question 1

Gills were the first gas exchange organ to evolve in animals.

Accepted Answer

A) True 
 B)False

Question 2

People with sickle-cell anemia have deformed hemoglobin molecules and often suffer muscle pains, even at low levels of exertion. These symptoms might come about because the deformed hemoglobin

Accepted Answer

A)   is unable to carry the oxygen required for normal activities of muscles.
B)   cannot diffuse across the cells' membranes from the blood plasma.
C)   causes damage to the muscle cells as it enters the muscle.
D)   decreases the person's surface area-to-volume ratio.

Question 3

If our skin were our gas exchange surface, it would have sufficient surface area to support our need for oxygen.

Accepted Answer

A) True 
 B)False

Question 4

The smaller the distance over which a gas must diffuse, the more slowly it will diffuse.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following best describes the journey of an oxygen molecule in a lung?

Accepted Answer

A)   It travels from an alveolus to a bronchiole to a capillary to a red blood cell to hemoglobin.
B)   It travels from a bronchiole to an alveolus to a capillary to hemoglobin to a red blood cell.
C)   It travels from a bronchiole to an alveolus to a capillary to a red blood cell to hemoglobin.
D)   It travels from a bronchiole to an alveolus to a red blood cell to a capillary to hemoglobin.

Question 6

Ectothermic animals have a larger surface area available for gas exchange than endothermic animals.

Accepted Answer

A) True 
 B)False

Question 7

The _______ that aquatic animals use for gas exchange have evolved several times, but they are always structured to provide the maximum surface area for gas exchange.

Accepted Answer

The answer of The _______ that aquatic animals use for...

Question 8

The _______ of insects are tubes that allow oxygen in the atmosphere to reach the gas exchange surfaces inside the insects.

Accepted Answer

The answer of The _______ of insects are tubes that...

Question 9

The figure below illustrates the respiratory surface of an animal relative to its body surface. 
Would you expect this respiratory surface to be found in an aquatic or terrestrial animal?

Accepted Answer

A)   Aquatic; having the respiratory surfaces inside the body saves energy since water is less dense than air and can therefore be more easily moved through an internal respiratory organ.
B)   Aquatic; having an external respiratory surface allows the animal to create a larger surface area for gas exchange.
C)   Terrestrial; by having the respiratory surface inside the body, terrestrial animals reduce water loss.
D)   Terrestrial; having the respiratory surfaces inside the body prevents gases other than oxygen from entering the body.

Question 10

Blood in a capillary leaving a nearby cell would contain

Accepted Answer

A)   a lower concentration of carbon dioxide than when it arrived.
B)   a higher concentration of carbon dioxide than when it arrived.
C)   a higher concentration of oxygen than when it arrived.
D)   less hemoglobin than when it arrived.

Question 11

Which of the following would contain the lowest concentration of oxygen?

Accepted Answer

A)   a lake covered by a sheet of ice
B)   air at sea level
C)   air 1,000 ft. above sea level
D)   a warm pond

Question 12

When we inhale, air moves in through the mouth or nose and next moves into the

Accepted Answer

A)   bronchi.
B)   alveoli.
C)   lungs.
D)   pharynx.

Question 13

Once oxygen has entered the blood stream, its ultimate destination is the

Accepted Answer

A)   alveoli.
B)   lungs.
C)   cells.
D)   mitochondria.

Question 14

Which of the following describes the journey of a molecule of oxygen from the pharynx to an alveolus?

Accepted Answer

A)   pharynx to trachea to bronchus to bronchiole to alveolus
B)   pharynx to trachea to bronchiole to bronchus to alveolus
C)   pharynx to bronchiole to bronchus to trachea to alveolus
D)   pharynx to bronchus to bronchiole to trachea to alveolus

Question 15

Which of the following would not be a characteristic of an organ used for gas exchange?

Accepted Answer

A)   high surface area
B)   covered by waterproofing layers
C)   moist surfaces
D)   very thin tissues

Question 16

The tiniest bronchiole extensions open into the

Accepted Answer

A)   trachea.
B)   bronchi.
C)   alveoli.
D)   pharynx.

Question 17

Which of the following is not a genetic adaptation that has evolved in people who live at high altitudes?

Accepted Answer

A)   large lungs
B)   rapid breathing
C)   higher hemoglobin concentration in their blood
D)   ability of the hemoglobin in their blood to pick up oxygen more readily from the plasma

Question 18

Which of the following statements about gas concentrations in air and water is true?

Accepted Answer

A)   Carbon dioxide is not found in water.
B)   Carbon dioxide occurs in similar concentrations in air and water.
C)   Oxygen occurs in similar concentrations in air and water.
D)   Oxygen occurs in higher concentrations in air than in water.

Question 19

Hemoglobin

Accepted Answer

A)   is an enzyme involved in the process of cellular respiration.
B)   transports oxygen from cells undergoing cellular respiration to red blood cells.
C)   binds to oxygen and releases it near cells performing cellular respiration.
D)   makes the blood more acidic, enabling it to absorb more oxygen.

Question 20

Hemoglobin, like many other oxygen-binding pigments, contains the metallic element ____.

Accepted Answer

The answer of Hemoglobin, like many other oxygen-binding pigments, contains...

Exam 22: Gas Exchange

If our skin were our gas exchange surface, it would have sufficient surface area to support our need for oxygen.

Correct AnswerverifiedShow Answer

Blood in a capillary leaving a nearby cell would contain

Correct AnswerverifiedShow Answer

Which of the following describes the journey of a molecule of oxygen from the pharynx to an alveolus?

Correct AnswerverifiedShow Answer

Which of the following best describes the journey of an oxygen molecule in a lung?

Correct AnswerverifiedShow Answer

The figure below illustrates the respiratory surface of an animal relative to its body surface. Would you expect this respiratory surface to be found in an aquatic or terrestrial animal?

Correct AnswerverifiedShow Answer

Gills were the first gas exchange organ to evolve in animals.

Correct AnswerverifiedShow Answer

The _______ that aquatic animals use for gas exchange have evolved several times, but they are always structured to provide the maximum surface area for gas exchange.

Correct AnswerverifiedShow Answer

Hemoglobin, like many other oxygen-binding pigments, contains the metallic element ____.

Correct AnswerverifiedShow Answer

The smaller the distance over which a gas must diffuse, the more slowly it will diffuse.

Correct AnswerverifiedShow Answer

Hemoglobin

Correct AnswerverifiedShow Answer

The _______ of insects are tubes that allow oxygen in the atmosphere to reach the gas exchange surfaces inside the insects.

Correct AnswerverifiedShow Answer

Once oxygen has entered the blood stream, its ultimate destination is the

Correct AnswerverifiedShow Answer

When we inhale, air moves in through the mouth or nose and next moves into the

Correct AnswerverifiedShow Answer

Which of the following statements about gas concentrations in air and water is true?

Correct AnswerverifiedShow Answer

People with sickle-cell anemia have deformed hemoglobin molecules and often suffer muscle pains, even at low levels of exertion. These symptoms might come about because the deformed hemoglobin

Correct AnswerverifiedShow Answer

Which of the following would contain the lowest concentration of oxygen?

Correct AnswerverifiedShow Answer

Which of the following is not a genetic adaptation that has evolved in people who live at high altitudes?

Correct AnswerverifiedShow Answer

The tiniest bronchiole extensions open into the

Correct AnswerverifiedShow Answer

Which of the following would not be a characteristic of an organ used for gas exchange?

Correct AnswerverifiedShow Answer

Ectothermic animals have a larger surface area available for gas exchange than endothermic animals.

Correct AnswerverifiedShow Answer

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