Question 1

Which of the following is not a unit of pressure?

Accepted Answer

A)  Millimeters of mercury 
B)  Pascals 
C)  Pounds per square inch 
D)  mL O2/L 
A)  Millimeters of mercury 
B)  Pascals 
C)  Pounds per square inch 
D)  mL O2/L

Question 2

When a diving beetle is underwater with its air bubble, oxygen diffuses from the

Accepted Answer

A)  animal into the bubble. 
B)  water directly into the animal. 
C)  bubble into the surrounding water. 
D)  water into the bubble. 
A)  animal into the bubble. 
B)  water directly into the animal. 
C)  bubble into the surrounding water. 
D)  water into the bubble.

Question 3

Refer to the figure shown.
  At what point(s) in the figure is the partial pressure of oxygen the lowest?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
A)  1 
B)  2 
C)  3 
D)  4

Question 4

Which statement regarding gas mixtures in aqueous solutions is false?

Accepted Answer

A)  When a gas dissolves in a solution, it becomes incorporated into the liquid phase. 
B)  When a gas dissolves in a solution, the molecules become distributed among the H2O molecules in much the same way as glucose molecules do. 
C)  Gas in solution can appear as microscopic bubbles. 
D)  When a large bubble rises to the surface of a solution, the solution is considered to be in the gas phase. 
A)  When a gas dissolves in a solution, it becomes incorporated into the liquid phase. 
B)  When a gas dissolves in a solution, the molecules become distributed among the H2O molecules in much the same way as glucose molecules do. 
C)  Gas in solution can appear as microscopic bubbles. 
D)  When a large bubble rises to the surface of a solution, the solution is considered to be in the gas phase.

Question 5

One of the most important aspects of whether a particular microenvironment will experience hypoxia is

Accepted Answer

A)  the initial oxygen content. 
B)  the initial carbon dioxide content. 
C)  rate of air or water exchange. 
D)  whether the respiratory medium is gas or liquid. 
A)  the initial oxygen content. 
B)  the initial carbon dioxide content. 
C)  rate of air or water exchange. 
D)  whether the respiratory medium is gas or liquid.

Question 6

What is meant by the oxygen cascade?

Accepted Answer

The oxygen cascade is a concept that sum

Question 7

If 2 L of air at 0°C contains 420 mL of O2, how many mL of O2 does it contain if the air is warmed to 24°C?

Accepted Answer

A)  210 mL 
B)  384 mL 
C)  420 mL 
D)  about 600 mL 
A)  210 mL 
B)  384 mL 
C)  420 mL 
D)  about 600 mL

Question 8

Which statement regarding the diffusion of materials between gas mixtures and aqueous solutions is false?

Accepted Answer

A)  Diffusion can be predicted by means of partial pressure measurements. 
B)  Diffusion can be predicted by using concentrations. 
C)  Respiratory gases can exist in the gas phase as well as dissolved in an aqueous solution. 
D)  Each gas has a unique solubility in aqueous solution. 
A)  Diffusion can be predicted by means of partial pressure measurements. 
B)  Diffusion can be predicted by using concentrations. 
C)  Respiratory gases can exist in the gas phase as well as dissolved in an aqueous solution. 
D)  Each gas has a unique solubility in aqueous solution.

Question 9

Why are volumes of gases expressed at standard conditions of temperature and pressure (STP)?

Accepted Answer

A)  Because animals live at different temperatures and pressures. 
B)  Because the internal conditions of animals are always at different temperatures and pressures. 
C)  Because the volume occupied by any given molar amount of gas depends on temperature and pressure. 
D)  Because gases are always expressed as volume. 
A)  Because animals live at different temperatures and pressures. 
B)  Because the internal conditions of animals are always at different temperatures and pressures. 
C)  Because the volume occupied by any given molar amount of gas depends on temperature and pressure. 
D)  Because gases are always expressed as volume.

Question 10

The Krogh diffusion coefficient (K) for O2 in air is _______ K for O2 in water.

Accepted Answer

A)  slightly greater than 
B)  slightly lower than 
C)  about 200,000 times lower than 
D)  about 200,000 times greater than 
A)  slightly greater than 
B)  slightly lower than 
C)  about 200,000 times lower than 
D)  about 200,000 times greater than

Question 11

Why is it important for scuba divers to understand the concept of diffusion, especially as it pertains to N2?

Accepted Answer

As a diver dives, she is exposed to very

Question 12

Refer to the figure shown.
  According to the data in the figure, the partial pressures at sea level total

Accepted Answer

A)  1 atm. 
B)  0.5 atm. 
C)  100%. 
D)  1 kPa. 
A)  1 atm. 
B)  0.5 atm. 
C)  100%. 
D)  1 kPa.

Question 13

Which molecules are respiratory gases or chemical forms of respiratory gases?
I. O2
II. O3
III. CO2
IV. HCO3-
V. N2

Accepted Answer

A)  I, II, and III 
B)  I, II, III, and IV 
C)  I, III, and IV 
D)  I, III, and V 
A)  I, II, and III 
B)  I, II, III, and IV 
C)  I, III, and IV 
D)  I, III, and V

Question 14

Compare and contrast mole fractional concentration versus volume fractional concentration.

Accepted Answer

Both mole fractional concentration and v

Question 15

What are the three most important characteristics of gases dissolved in aqueous solutions? Give examples in your answer.

Accepted Answer

(1) The solubilities of different gases

Question 16

Refer to the figure shown.
  If the total pressure was 0.5 atm, the partial pressure of O2 would be _______ atm.

Accepted Answer

A)  20.95 
B)  10.48 
C)  0.2095 
D)  0.1048 
A)  20.95 
B)  10.48 
C)  0.2095 
D)  0.1048

Question 17

Consider two gas mixtures that are identical in temperature. The concentration of O2 in mixture #1 is 20 mmol/L, and the concentration of O2 in mixture #2 is 60 mmol/L. Which statement about the mixtures is true?

Accepted Answer

A)  The partial pressure of O2 in mixture #2 is three times higher than it is in mixture #1. 
B)  The partial pressure of O2 in mixture #2 is 3 times lower than it is in mixture #1. 
C)  The percent of O2 in mixture #2 is three times higher than it is in mixture #1. 
D)  The partial pressures of O2 in both mixtures are the same. 
A)  The partial pressure of O2 in mixture #2 is three times higher than it is in mixture #1. 
B)  The partial pressure of O2 in mixture #2 is 3 times lower than it is in mixture #1. 
C)  The percent of O2 in mixture #2 is three times higher than it is in mixture #1. 
D)  The partial pressures of O2 in both mixtures are the same.

Question 18

Explain the two mechanisms by which oxygen and carbon dioxide move within organisms.

Accepted Answer

Respiratory gases move from place to pla

Question 19

The _______ of a particular gas in a mixture is the dissolved concentration of that gas when the partial pressure is 1 atm.

Accepted Answer

A)  gas tension 
B)  absorption coefficient 
C)  volume fractional concentration 
D)  density 
A)  gas tension 
B)  absorption coefficient 
C)  volume fractional concentration 
D)  density

Question 20

What is STP and why is it important when expressing volumes of gases? Include information about the relationship between STP and 1 mole of gas.

Accepted Answer

STP stands for Standard Conditions of Te

Exam 22: Introduction to Oxygen and Carbon Dioxide in Physiology

Which of the following is not a unit of pressure?

When a diving beetle is underwater with its air bubble, oxygen diffuses from the

Refer to the figure shown. At what point(s) in the figure is the partial pressure of oxygen the lowest?

Which statement regarding gas mixtures in aqueous solutions is false?

One of the most important aspects of whether a particular microenvironment will experience hypoxia is

What is meant by the oxygen cascade?

If 2 L of air at 0°C contains 420 mL of O2, how many mL of O2 does it contain if the air is warmed to 24°C?

Which statement regarding the diffusion of materials between gas mixtures and aqueous solutions is false?

Why are volumes of gases expressed at standard conditions of temperature and pressure (STP)?

The Krogh diffusion coefficient (K) for O2 in air is _______ K for O2 in water.

Why is it important for scuba divers to understand the concept of diffusion, especially as it pertains to N2?

Refer to the figure shown. According to the data in the figure, the partial pressures at sea level total

Which molecules are respiratory gases or chemical forms of respiratory gases? I. O2 II. O3 III. CO2 IV. HCO3- V. N2

Compare and contrast mole fractional concentration versus volume fractional concentration.

What are the three most important characteristics of gases dissolved in aqueous solutions? Give examples in your answer.

Refer to the figure shown. If the total pressure was 0.5 atm, the partial pressure of O2 would be _______ atm.

Consider two gas mixtures that are identical in temperature. The concentration of O2 in mixture #1 is 20 mmol/L, and the concentration of O2 in mixture #2 is 60 mmol/L. Which statement about the mixtures is true?

Explain the two mechanisms by which oxygen and carbon dioxide move within organisms.

The _______ of a particular gas in a mixture is the dissolved concentration of that gas when the partial pressure is 1 atm.

What is STP and why is it important when expressing volumes of gases? Include information about the relationship between STP and 1 mole of gas.

Animals and Environments: Function on the Ecological Stage

Molecules and Cells in Animal Physiology

Genomics, Proteomics, and Related Approaches to Physiology

Physiological Development and Epigenetics

Transport of Solutes and Water

Nutrition, Feeding, and Digestion

Energy Metabolism

Aerobic and Anaerobic Forms of Metabolism

The Energetics of Aerobic Activity

Thermal Relations

Food, Energy, and Temperature at Work: The Lives of Mammals in Frigid Places

Neurons

Synapses

Sensory Processes

Nervous System Organization and Biological Clocks

Endocrine and Neuroendocrine Physiology

Reproduction

Integrating Systems at Work: Animal Navigation

Control of Movement

Muscle

Movement and Muscle at Work: Plasticity in Response to Use and Disuse

External Respiration: the Physiology of Breathing

Transport of Oxygen and Carbon Dioxide in Body Fluids With an Introduction to Acid- Base Physiology

Circulation

Oxygen, Carbon Dioxide, and Internal Transport at Work: Diving by Marine Mammals

Water and Salt Physiology: Introduction and Mechanisms

Kidneys and Excretion With Notes on Nitrogen Excretion

Water, Salts, and Excretion at Work: Mammals of Deserts and Dry Savannas

Water and Salt Physiology of Animals in Their Environments

Filters

If 2 L of air at 0°C contains 420 mL of O₂, how many mL of O₂ does it contain if the air is warmed to 24°C?

The Krogh diffusion coefficient (K) for O₂ in air is _______ K for O₂ in water.

Why is it important for scuba divers to understand the concept of diffusion, especially as it pertains to N₂?

Which molecules are respiratory gases or chemical forms of respiratory gases? I. O₂ II. O₃ III. CO₂ IV. HCO₃^- V. N₂

Refer to the figure shown. If the total pressure was 0.5 atm, the partial pressure of O₂ would be _______ atm.

Consider two gas mixtures that are identical in temperature. The concentration of O₂ in mixture #1 is 20 mmol/L, and the concentration of O₂ in mixture #2 is 60 mmol/L. Which statement about the mixtures is true?