Question 1

Carbon dioxide is transported in the blood principally as

Accepted Answer

A)  carbaminohemoglobin. 
B)  dissolved CO2 in solution in the blood. 
C)  bicarbonate. 
D)  carbon monoxide. 
A)  carbaminohemoglobin. 
B)  dissolved CO2 in solution in the blood. 
C)  bicarbonate. 
D)  carbon monoxide. C

Question 2

Ventilation may drift upward during constant-load submaximal exercise performed in a hot and humid environment due to

Accepted Answer

A)  a lower arterial PO2. 
B)  a higher PCO2. 
C)  higher blood temperature. 
D)  all of the above. 
A)  a lower arterial PO2. 
B)  a higher PCO2. 
C)  higher blood temperature. 
D)  all of the above. C

Question 3

Exercise-induced hypoxemia that may occur in elite endurance athletes during heavy exercise is likely due to

Accepted Answer

A)  overt lung disease. 
B)  reduced alveolar ventilation due to exercise-induced asthma. 
C)  a right-to-left shunt. 
D)  a diffusion limitation secondary to a rapid red blood cell transit time. 
A)  overt lung disease. 
B)  reduced alveolar ventilation due to exercise-induced asthma. 
C)  a right-to-left shunt. 
D)  a diffusion limitation secondary to a rapid red blood cell transit time. D

Question 4

During exercise at sea level, young, healthy untrained subjects generally maintain exercise arterial PO2 within

Accepted Answer

A)  1 mm Hg of resting values. 
B)  10-12 mm Hg of resting values. 
C)  15-20 mm Hg of resting values. 
D)  30-40 mm Hg of resting values. 
A)  1 mm Hg of resting values. 
B)  10-12 mm Hg of resting values. 
C)  15-20 mm Hg of resting values. 
D)  30-40 mm Hg of resting values.

Question 5

The primary purpose of the pulmonary system is

Accepted Answer

A)  ventilation. 
B)  to provide an interface for gas exchange. 
C)  to transport O2 and CO2 in the blood. 
D)  formation of surfactant. 
A)  ventilation. 
B)  to provide an interface for gas exchange. 
C)  to transport O2 and CO2 in the blood. 
D)  formation of surfactant.

Question 6

In a pulmonary function test, a FEV1/FVC ratio of 0.70 is

Accepted Answer

A)  considered normal. 
B)  higher than normal. 
C)  suggestive of airway obstruction. 
D)  associated with a high VO2 max. 
A)  considered normal. 
B)  higher than normal. 
C)  suggestive of airway obstruction. 
D)  associated with a high VO2 max.

Question 7

The carotid bodies are chemoreceptors that are sensitive to changes in arterial

Accepted Answer

A)  H+ and K+ concentrations. 
B)  pH, PCO2, and PO2. 
C)  pH and K+ concentrations. 
D)  PO2 only. 
A)  H+ and K+ concentrations. 
B)  pH, PCO2, and PO2. 
C)  pH and K+ concentrations. 
D)  PO2 only.

Question 8

Most of the O2 that is transported in the blood is in

Accepted Answer

A)  a solution as a dissolved gas. 
B)  the form of oxyhemoglobin. 
C)  the form of carboxyhemoglobin. 
D)  the form of deoxyhemoglobin. 
A)  a solution as a dissolved gas. 
B)  the form of oxyhemoglobin. 
C)  the form of carboxyhemoglobin. 
D)  the form of deoxyhemoglobin.

Question 9

The alinear rise in ventilation observed during incremental exercise (i.e., ventilatory threshold) is thought to be principally due to

Accepted Answer

A)  a decrease in arterial PO2. 
B)  an increase in arterial PCO2. 
C)  an increase in arterial pH. 
D)  a decrease in arterial pH. 
A)  a decrease in arterial PO2. 
B)  an increase in arterial PCO2. 
C)  an increase in arterial pH. 
D)  a decrease in arterial pH.

Question 10

The ventilatory central chemoreceptors respond to changes in the

Accepted Answer

A)  pH of mixed venous blood. 
B)  pH of cerebral spinal fluid. 
C)  PO2, pH, and PCO2 of arterial blood. 
D)  PCO2 and H+ of mixed venous blood. 
A)  pH of mixed venous blood. 
B)  pH of cerebral spinal fluid. 
C)  PO2, pH, and PCO2 of arterial blood. 
D)  PCO2 and H+ of mixed venous blood.

Question 11

Under normal conditions, the characteristics of arterial blood include

Accepted Answer

A)  PO2 of 100 mmHg. 
B)  oxyhemoglobin saturation of 97-98%. 
C)  oxygen content of 20 ml O2 / 100 ml blood. 
D)  all of the above. 
A)  PO2 of 100 mmHg. 
B)  oxyhemoglobin saturation of 97-98%. 
C)  oxygen content of 20 ml O2 / 100 ml blood. 
D)  all of the above.

Question 12

In response to exercise training, the normal lung

Accepted Answer

A)  increases the number of alveoli. 
B)  does not undergo measurable changes. 
C)  decreases anatomical dead space. 
D)  increases total lung volume. 
A)  increases the number of alveoli. 
B)  does not undergo measurable changes. 
C)  decreases anatomical dead space. 
D)  increases total lung volume.

Question 13

The term ventilation refers to the

Accepted Answer

A)  cooling of the airways by respiration. 
B)  random movement of molecules from an area of high concentration to an area of lower concentration. 
C)  mechanical process of moving air in and out of the lungs. 
D)  oxygenation of blood as it travels through the lungs. 
A)  cooling of the airways by respiration. 
B)  random movement of molecules from an area of high concentration to an area of lower concentration. 
C)  mechanical process of moving air in and out of the lungs. 
D)  oxygenation of blood as it travels through the lungs.

Question 14

A decrease in arterial PO2 below 70 mm Hg would likely result in

Accepted Answer

A)  a decrease in alveolar ventilation. 
B)  an increase in alveolar ventilation. 
C)  no change in alveolar ventilation. 
A)  a decrease in alveolar ventilation. 
B)  an increase in alveolar ventilation. 
C)  no change in alveolar ventilation.

Question 15

Activation of rectus abdominis muscles would result in

Accepted Answer

A)  active inspiration. 
B)  passive inspiration. 
C)  active expiration. 
D)  passive expiration. 
A)  active inspiration. 
B)  passive inspiration. 
C)  active expiration. 
D)  passive expiration.

Question 16

The volume of gas that reaches the respiratory zone (gas-exchange zone) of the lung is termed

Accepted Answer

A)  anatomical dead space. 
B)  minute ventilation. 
C)  alveolar ventilation. 
D)  tidal volume. 
A)  anatomical dead space. 
B)  minute ventilation. 
C)  alveolar ventilation. 
D)  tidal volume.

Question 17

Under normal conditions, the partial pressure of oxygen in the alveoli is

Accepted Answer

A)  760 mmHg. 
B)  159 mmHg. 
C)  105 mmHg. 
D)  100 mmHg. 
A)  760 mmHg. 
B)  159 mmHg. 
C)  105 mmHg. 
D)  100 mmHg.

Question 18

Exercise-induced asthma would reduce airflow by

Accepted Answer

A)  lowering the atmospheric pressure. 
B)  lowering the intrapulmonary pressure. 
C)  inhibiting action potentials to the diaphragm. 
D)  increasing airway resistance. 
A)  lowering the atmospheric pressure. 
B)  lowering the intrapulmonary pressure. 
C)  inhibiting action potentials to the diaphragm. 
D)  increasing airway resistance.

Question 19

Mitochondrial PO2 is _____________ capillary PO2.

Accepted Answer

A)  greater than 
B)  less than 
C)  equal to 
A)  greater than 
B)  less than 
C)  equal to

Question 20

Myoglobin is a red pigment found in skeletal muscle that serves to

Accepted Answer

A)  transport CO2 from the cell membrane to the mitochondria. 
B)  transport O2 from the cell membrane to the mitochondria. 
C)  buffer changes in hydrogen ion concentration in the cell. 
D)  transport O2 from the mitochondria to the cell membrane. 
A)  transport CO2 from the cell membrane to the mitochondria. 
B)  transport O2 from the cell membrane to the mitochondria. 
C)  buffer changes in hydrogen ion concentration in the cell. 
D)  transport O2 from the mitochondria to the cell membrane.

Exam 11: Respiration During Exercise

Carbon dioxide is transported in the blood principally as

Ventilation may drift upward during constant-load submaximal exercise performed in a hot and humid environment due to

Exercise-induced hypoxemia that may occur in elite endurance athletes during heavy exercise is likely due to

During exercise at sea level, young, healthy untrained subjects generally maintain exercise arterial PO2 within

The primary purpose of the pulmonary system is

In a pulmonary function test, a FEV1/FVC ratio of 0.70 is

The carotid bodies are chemoreceptors that are sensitive to changes in arterial

Most of the O2 that is transported in the blood is in

The alinear rise in ventilation observed during incremental exercise (i.e., ventilatory threshold) is thought to be principally due to

The ventilatory central chemoreceptors respond to changes in the

Under normal conditions, the characteristics of arterial blood include

In response to exercise training, the normal lung

The term ventilation refers to the

A decrease in arterial PO2 below 70 mm Hg would likely result in

Activation of rectus abdominis muscles would result in

The volume of gas that reaches the respiratory zone (gas-exchange zone) of the lung is termed

Under normal conditions, the partial pressure of oxygen in the alveoli is

Exercise-induced asthma would reduce airflow by

Mitochondrial PO2 is _____________ capillary PO2.

Myoglobin is a red pigment found in skeletal muscle that serves to

Introduction to Exercise Physiology

Common Measurements in Exercise Physiology

Control of the Internal Environment

Bioenergetics

Exercise Metabolism

Cell Signaling and the Hormonal Responses to Exercise

Exercise and the Immune System

The Nervous System: Structure and Control of Movement

Skeletal Muscle: Structure and Function

Circulatory Responses to Exercise

Acid-Base Balance During Exercise

Temperature Regulation

The Physiology of Training: Effect on Vo2 Max, Performance, and Strength

Risk Factors and Inflammation: Links to Chronic Disease

Exercise Prescriptions for Health and Fitness

Exercise for Special Populations

Body Composition and Nutrition for Health

Factors Affecting Performance

Laboratory Assessment of Human Performance

Training for Performance

Training for the Female Athlete, Children, Special Populations, and the Masters Athlete

Nutrition, Body Composition, and Performance

Exercise and the Environment

Ergogenic Aids

Filters

During exercise at sea level, young, healthy untrained subjects generally maintain exercise arterial PO₂ within

In a pulmonary function test, a FEV₁/FVC ratio of 0.70 is

Most of the O₂ that is transported in the blood is in

A decrease in arterial PO₂ below 70 mm Hg would likely result in

Mitochondrial PO₂ is _____________ capillary PO₂.