Question 1

A student in your lab volunteers to enter a hypoxic breathing chamber for 10 minutes, and his alveolar PO₂ drops to 50 mm Hg.What other change would occur?

Accepted Answer

A)   decrease in arterial pH
B)   decrease in arterial PCO₂
C)   decrease in pH of cerebrospinal fluid
D)   increase in alveolar PCO₂
E)   hypoventilationF) A) and E)
G) A) and D)

Question 2

What are the three ways CO₂ is transported in blood? Approximately what percentage is transported by each way?

Accepted Answer

1.attached to hemogl...

Question 3

Carbon dioxide is more soluble in water than oxygen.To get the same amount of oxygen to dissolve in plasma as carbon dioxide, you would have to

Accepted Answer

A)   decrease the temperature of the plasma.
B)   increase the partial pressure of oxygen.
C)   decrease the partial pressure of nitrogen.
D)   increase the rate of plasma flow through the lungs.
E)   decrease the alveolar ventilation rate.F) A) and B)
G) A) and C)

Question 4

List and explain the factors that influence gas diffusion in the lungs.

Accepted Answer

Concentration gradient, surface area, me...

Question 5

The carotid and aortic bodies contain specialized ________ cells, which can increase ventilation in response to changes in PO₂, PCO₂, or pH.

Accepted Answer

The answer of The carotid and aortic bodies contain specialized...

Question 6

Which of the following characteristics makes hemoglobin's structure such a good match for its function as an oxygen carrier?

Accepted Answer

A)   Each hemoglobin molecule can bind one oxygen molecule.
B)   Each hemoglobin molecule can bind two oxygen molecules.
C)   Each hemoglobin molecule can bind four oxygen molecules.
D)   Each hemoglobin molecule can't be saturated by oxygen molecules.
E)   Each hemoglobin binds irreversibly to an oxygen molecule.F) None of the above
G) C) and D)

Question 7

An increase in the level of carbon dioxide in the blood will

Accepted Answer

A)   decrease the rate of breathing.
B)   increase the rate of breathing.
C)   decrease pulmonary ventilation.
D)   decrease the alveolar ventilation rate.
E)   increase the pH of arterial blood.F) A) and C)
G) All of the above B

Question 8

If the partial pressure of oxygen in both air and water is 100 mm Hg, then the concentration of the oxygen is the same in the air and water.

Accepted Answer

A) True 
 B)False

Question 9

Match the factor with its effect on the affinity of hemoglobin for oxygen.
-increased pH

Accepted Answer

A)  increase
B)  decreaseC) A) and B)
D) undefined

Question 10

Match the factor with its effect on the affinity of hemoglobin for oxygen.
-increased temperature

Accepted Answer

A)  increase
B)  decreaseC) A) and B)
D) undefined

Question 11

Draw a flow chart that shows the components of the reflex in which an increase in blood PCO₂ leads to increased ventilation.

Accepted Answer

Peripheral chemoreceptors in carotid and aortic bodies detect changes in PCO₂ and pH.Central chemoreceptors in the medulla oblongata monitor CO₂ in CSF.Either an increase in PCO₂ or decrease in pH will stimulate the receptors, which project to a control center in the medulla oblongata.The control center stimulates somatic motor neurons that control the skeletal muscles involved in ventilation.The effect is increased ventilation, which lowers PCO₂ by eliminating CO₂, so blood pH increases because of this shift.

Question 12

Most of the carbon dioxide in the blood is transported as

Accepted Answer

A)   solute dissolved in the plasma.
B)   carbaminohemoglobin.
C)   bicarbonate ions.
D)   solute dissolved in the cytoplasm of red blood cells.
E)   carbonic acid.F) C) and D)
G) A) and B)

Question 13

________ is the enzyme that converts CO₂ into bicarbonate ions.

Accepted Answer

The answer of ________ is the enzyme that converts CO₂...

Question 14

Match the lung disease to its description.
-fluid accumulation in interstitial spaces

Accepted Answer

A)  fibrotic lung disease
B)  emphysema
C)  asthma
D)  pulmonary edemaE) All of the above
F) A) and B)

Question 15

PCO₂ tends to be ________ in tissues than in systemic capillaries.

Accepted Answer

The answer of PCO₂ tends to be ________ in tissues...

Question 16

Which of the following would make the oxygen-hemoglobin curve shift right?

Accepted Answer

A)   increased H⁺ concentration
B)   increased pH
C)   decreased temperature
D)   decreased CO₂
E)   None of the answers are correct.F) A) and E)
G) B) and E) A

Question 17

Hypoxia resulting from fluid accumulation in the alveoli that cannot be corrected by oxygen therapy can lead to

Accepted Answer

A)   emphysema.
B)   fibrotic lung disease.
C)   asthma.
D)   adult respiratory distress syndrome.
E)   sudden infant death syndrome.F) C) and E)
G) A) and B)

Question 18

Drowning is often the introduction of outside water into the alveoli, yet some water is normally present in alveoli.Why is water normally present in the alveoli? What is present in alveolar fluid, besides water, that aids in respiration? What properties of water are detrimental to respiration? What causes drowning? While extremely rare, there have even been documented cases of people walking away from recreational swimming only to die later, on dry land, as a result of drowning (termed "delayed" or "secondary" drowning).Propose an explanation for delayed drowning.

Accepted Answer

Water is present everywhere in living ti...

Question 19

The Hering-Breuer reflex

Accepted Answer

A)   functions to increase ventilation with changes in blood pressure.
B)   alters pulmonary ventilation when the PO₂ changes.
C)   alters pulmonary ventilation when the PCO₂ changes.
D)   prevents overexpansion of the lungs.
E)   is an important aspect of normal, quiet breathing.F) A) and B)
G) All of the above

Question 20

Match the factor with its effect on the affinity of hemoglobin for oxygen.
-increased 2,3-DPG

Accepted Answer

A)  increase
B)  decreaseC) A) and B)
D) undefined

Exam 18: Gas Exchange and Transport

A student in your lab volunteers to enter a hypoxic breathing chamber for 10 minutes, and his alveolar PO₂ drops to 50 mm Hg.What other change would occur?

Correct Answer
verified

What are the three ways CO₂ is transported in blood? Approximately what percentage is transported by each way?

Correct Answer
verified
1.attached to hemogl...
View Answer

Carbon dioxide is more soluble in water than oxygen.To get the same amount of oxygen to dissolve in plasma as carbon dioxide, you would have to

Correct Answer
verified

List and explain the factors that influence gas diffusion in the lungs.

Correct Answer
verified
Concentration gradient, surface area, me...
View Answer

The carotid and aortic bodies contain specialized ________ cells, which can increase ventilation in response to changes in PO₂, PCO₂, or pH.

Correct Answer
verified

Which of the following characteristics makes hemoglobin's structure such a good match for its function as an oxygen carrier?

Correct Answer
verified

An increase in the level of carbon dioxide in the blood will

Correct Answer
verified
B

If the partial pressure of oxygen in both air and water is 100 mm Hg, then the concentration of the oxygen is the same in the air and water.

Correct Answer
verified

Match the factor with its effect on the affinity of hemoglobin for oxygen. -increased pH

Correct Answer
verified

Match the factor with its effect on the affinity of hemoglobin for oxygen. -increased temperature

Correct Answer
verified

Draw a flow chart that shows the components of the reflex in which an increase in blood PCO₂ leads to increased ventilation.

Most of the carbon dioxide in the blood is transported as

Correct Answer
verified

________ is the enzyme that converts CO₂ into bicarbonate ions.

Correct Answer
verified

Match the lung disease to its description. -fluid accumulation in interstitial spaces

Correct Answer
verified

PCO₂ tends to be ________ in tissues than in systemic capillaries.

Correct Answer
verified

Which of the following would make the oxygen-hemoglobin curve shift right?

Correct Answer
verified
A

Hypoxia resulting from fluid accumulation in the alveoli that cannot be corrected by oxygen therapy can lead to

Correct Answer
verified

Correct Answer
verified
Water is present everywhere in living ti...
View Answer

The Hering-Breuer reflex

Correct Answer
verified

Match the factor with its effect on the affinity of hemoglobin for oxygen. -increased 2,3-DPG

Correct Answer
verified

Exam 18: Gas Exchange and Transport

A student in your lab volunteers to enter a hypoxic breathing chamber for 10 minutes, and his alveolar PO₂ drops to 50 mm Hg.What other change would occur?

Correct AnswerverifiedShow Answer

What are the three ways CO₂ is transported in blood? Approximately what percentage is transported by each way?

Correct Answerverified1.attached to hemogl...View AnswerShow Answer

Carbon dioxide is more soluble in water than oxygen.To get the same amount of oxygen to dissolve in plasma as carbon dioxide, you would have to

Correct AnswerverifiedShow Answer

List and explain the factors that influence gas diffusion in the lungs.

Correct AnswerverifiedConcentration gradient, surface area, me...View AnswerShow Answer

The carotid and aortic bodies contain specialized ________ cells, which can increase ventilation in response to changes in PO₂, PCO₂, or pH.

Correct AnswerverifiedShow Answer

Which of the following characteristics makes hemoglobin's structure such a good match for its function as an oxygen carrier?

Correct AnswerverifiedShow Answer

An increase in the level of carbon dioxide in the blood will

Correct AnswerverifiedB

If the partial pressure of oxygen in both air and water is 100 mm Hg, then the concentration of the oxygen is the same in the air and water.

Correct AnswerverifiedShow Answer

Match the factor with its effect on the affinity of hemoglobin for oxygen. -increased pH

Correct AnswerverifiedShow Answer

Match the factor with its effect on the affinity of hemoglobin for oxygen. -increased temperature

Correct AnswerverifiedShow Answer

Draw a flow chart that shows the components of the reflex in which an increase in blood PCO₂ leads to increased ventilation.

Most of the carbon dioxide in the blood is transported as

Correct AnswerverifiedShow Answer

________ is the enzyme that converts CO₂ into bicarbonate ions.

Correct AnswerverifiedShow Answer

Match the lung disease to its description. -fluid accumulation in interstitial spaces

Correct AnswerverifiedShow Answer

PCO₂ tends to be ________ in tissues than in systemic capillaries.

Correct AnswerverifiedShow Answer

Which of the following would make the oxygen-hemoglobin curve shift right?

Correct AnswerverifiedA

Hypoxia resulting from fluid accumulation in the alveoli that cannot be corrected by oxygen therapy can lead to

Correct AnswerverifiedShow Answer

Correct AnswerverifiedWater is present everywhere in living ti...View AnswerShow Answer

The Hering-Breuer reflex

Correct AnswerverifiedShow Answer

Match the factor with its effect on the affinity of hemoglobin for oxygen. -increased 2,3-DPG

Correct AnswerverifiedShow Answer

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Correct Answer
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1.attached to hemogl...
View Answer

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Concentration gradient, surface area, me...
View Answer

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Correct Answer
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B

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A

Correct Answer
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Correct Answer
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Water is present everywhere in living ti...
View Answer

Correct Answer
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Correct Answer
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