Question 1

The blood in the pulmonary vein is called mixed venous blood.

Accepted Answer

A) True 
 B)False

Question 2

Hyperpnea describes the increase in ventilation that occurs to meet an increase in metabolic demands of the tissues.

Accepted Answer

A) True 
 B)False

Question 3

The partial pressure of an individual gas within a mixture of gases is determined by the total pressure of those gases and the fractional concentration of that gas in the mixture.

Accepted Answer

A) True 
 B)False

Question 4

There is a substantial safety margin for the uptake of gases in the alveolus because at rest, blood is completely oxygenated after traveling only 1/3 the length of the pulmonary capillary bed.

Accepted Answer

A) True 
 B)False

Question 5

While carbon dioxide is more soluble in solution than oxygen, the amount of carbon dioxide produced by active cells is much greater than can dissolve in solution. Describe the mechanisms by which carbon dioxide is transported to the lungs with particular emphasis on carbon dioxide's binding to hemoglobin and its conversion to bicarbonate.

Accepted Answer

In the blood, carbon dioxide is stored i...

Question 6

Assuming resting conditions at sea level, what is the partial pressure of oxygen in systemic arteries?

Accepted Answer

A)   160 mm Hg
B)   46 mm Hg
C)   40 mm Hg
D)   80 mm Hg
E)   100 mm Hg

Question 7

A decrease in oxygen -carrying capacity can result from alterations in hemoglobin structure or concentration.

Accepted Answer

A) True 
 B)False

Question 8

Hemoglobin can bind O2, CO2 and H+ all at the same time.

Accepted Answer

A) True 
 B)False

Question 9

Hyperventilation will cause changes in PCO2 that are detected by the chemoreceptors which causes a(n)

Accepted Answer

A)   decrease in breathing rate and depth of breathing.
B)   increase in depth of breathing only.
C)   increase in breathing rate and depth of breathing.
D)   increase in breathing rate only.
E)   decrease in breathing rate only.

Question 10

Which of the following statements about 2,3 -BPG is FALSE?

Accepted Answer

A)   2,3 -BPG increases the affinity of hemoglobin for oxygen.
B)   2,3 -BPG is produced by red blood cells.
C)   2,3 -BPG is an intermediate of glycolysis.
D)   2,3 -BPG synthesis is inhibited by high levels of oxyhemoglobin.
E)   2,3 -BPG produces a rightward shift in the hemoglobin -oxygen dissociation curve.

Question 11

What is an increase in alveolar ventilation to match the demands of increased metabolic activity in the cells called?

Accepted Answer

A)   hyperpnea
B)   dyspnea
C)   hypoventilation
D)   hypopnea
E)   hyperventilation

Question 12

Assuming resting conditions at sea level, what is the partial pressure of carbon dioxide in pulmonary veins?

Accepted Answer

A)   40 mm Hg
B)   160 mm Hg
C)   80 mm Hg
D)   46 mm Hg
E)   100 mm Hg

Question 13

Gangrene is often caused by anaerobic bacteria deep in tissues that lack adequate blood flow and adequate oxygen supply. Many times, gangrene can be treated by putting the patient into a hyperbaric chamber. Which statement best describes why this type of therapy is effective?

Accepted Answer

A)   The increased pressure destroys the cell wall of the bacteria.
B)   When the patient is brought back to normal atmospheric pressure, carbon dioxide comes out of solution at high concentrations, which poisons the bacteria.
C)   The increased pressure drives nitrogen into the system and nitrogen gas poisons the bacteria.
D)   The increased pressure drives more oxygen into the bloodstream and, therefore, anaerobic bacteria cannot survive in the presence of oxygen.
E)   The increased pressure creates a higher pressure in the capillaries of the tissue and drives the toxin produced by the bacteria into the bloodstream, where it is diluted.

Question 14

Chemoreceptors respond primarily to changes in PCO2 indirectly by its effect on

Accepted Answer

A)   2,3 -diphosphoglycerate (2,3 -DPG)  concentration.
B)   PO2.
C)   hydrogen ion concentration.
D)   lactic acid concentration.
E)   hemoglobin concentration.

Question 15

What percentage of oxygen is transported by hemoglobin?

Accepted Answer

A)   86%
B)   98.5%
C)   5%
D)   1.5%
E)   75%

Question 16

Which of the following does NOT contribute to the rapid movement of gases into and out of the blood within the lungs?

Accepted Answer

A)   thin membrane
B)   permeability of the membrane
C)   rapid blood flow
D)   concentration gradient
E)   large surface area

Question 17

As oxygen binds to hemoglobin, the___________ of the hemoglobin molecule will change through a process of ________such that the binding of oxygen is enhanced.

Accepted Answer

A)   amino acid sequence : phosphorylation
B)   affinity : negative cooperativity
C)   cooperativity : negativity
D)   affinity : positive cooperativity
E)   cooperativity : positivity

Question 18

At sea level the air pressure which equals 1 atmosphere is

Accepted Answer

A)   100 mm Hg.
B)   500 mm Hg.
C)   150 mm Hg.
D)   760 mm Hg.
E)   600 mm Hg.

Question 19

Which of the following will increase the unloading of oxygen within the tissue?

Accepted Answer

A)   increased hydrogen ion concentration only
B)   increased PCO2 only
C)   increased body temperature only
D)   both increased hydrogen ion concentration and increased body temperature
E)   increased hydrogen ion concentration, increased body temperature, and increased PCO2

Question 20

The hydrogen ions released by the dissociation of carbonic acid are buffered by their

Accepted Answer

A)   binding to hemoglobin.
B)   active transport out of the erythrocyte.
C)   binding to DNA within the nucleus.
D)   transport into the erythrocyte as sodium ions move out.
E)   transport out of the erythrocyte as a sodium ion moves in.

Exam 17: The Respiratory System: Gas Exchange and the Regulation of Breathing

Assuming resting conditions at sea level, what is the partial pressure of oxygen in systemic arteries?

Correct Answer
verified

The hydrogen ions released by the dissociation of carbonic acid are buffered by their

Correct Answer
verified

Hemoglobin can bind O₂, CO₂and H⁺all at the same time.

Correct Answer
verified

Which of the following statements about 2,3 -BPG is FALSE?

Correct Answer
verified

Hyperventilation will cause changes in P_CO₂that are detected by the chemoreceptors which causes a(n)

Correct Answer
verified

At sea level the air pressure which equals 1 atmosphere is

Correct Answer
verified

A decrease in oxygen -carrying capacity can result from alterations in hemoglobin structure or concentration.

Correct Answer
verified

The partial pressure of an individual gas within a mixture of gases is determined by the total pressure of those gases and the fractional concentration of that gas in the mixture.

Correct Answer
verified

Gangrene is often caused by anaerobic bacteria deep in tissues that lack adequate blood flow and adequate oxygen supply. Many times, gangrene can be treated by putting the patient into a hyperbaric chamber. Which statement best describes why this type of therapy is effective?

Correct Answer
verified

There is a substantial safety margin for the uptake of gases in the alveolus because at rest, blood is completely oxygenated after traveling only 1/3 the length of the pulmonary capillary bed.

Correct Answer
verified

Assuming resting conditions at sea level, what is the partial pressure of carbon dioxide in pulmonary veins?

Correct Answer
verified

The blood in the pulmonary vein is called mixed venous blood.

Correct Answer
verified

Which of the following will increase the unloading of oxygen within the tissue?

Correct Answer
verified

As oxygen binds to hemoglobin, the___ of the hemoglobin molecule will change through a process of such that the binding of oxygen is enhanced.

Correct Answer
verified

Which of the following does NOT contribute to the rapid movement of gases into and out of the blood within the lungs?

Correct Answer
verified

What is an increase in alveolar ventilation to match the demands of increased metabolic activity in the cells called?

Correct Answer
verified

Chemoreceptors respond primarily to changes in P_CO₂indirectly by its effect on

Correct Answer
verified

What percentage of oxygen is transported by hemoglobin?

Correct Answer
verified

Correct Answer
verified
In the blood, carbon dioxide is stored i...
View Answer

Hyperpnea describes the increase in ventilation that occurs to meet an increase in metabolic demands of the tissues.

Correct Answer
verified

Exam 17: The Respiratory System: Gas Exchange and the Regulation of Breathing

Assuming resting conditions at sea level, what is the partial pressure of oxygen in systemic arteries?

Correct AnswerverifiedShow Answer

The hydrogen ions released by the dissociation of carbonic acid are buffered by their

Correct AnswerverifiedShow Answer

Hemoglobin can bind O2, CO2 and H+ all at the same time.

Correct AnswerverifiedShow Answer

Which of the following statements about 2,3 -BPG is FALSE?

Correct AnswerverifiedShow Answer

Hyperventilation will cause changes in PCO2 that are detected by the chemoreceptors which causes a(n)

Correct AnswerverifiedShow Answer

At sea level the air pressure which equals 1 atmosphere is

Correct AnswerverifiedShow Answer

A decrease in oxygen -carrying capacity can result from alterations in hemoglobin structure or concentration.

Correct AnswerverifiedShow Answer

The partial pressure of an individual gas within a mixture of gases is determined by the total pressure of those gases and the fractional concentration of that gas in the mixture.

Correct AnswerverifiedShow Answer

Gangrene is often caused by anaerobic bacteria deep in tissues that lack adequate blood flow and adequate oxygen supply. Many times, gangrene can be treated by putting the patient into a hyperbaric chamber. Which statement best describes why this type of therapy is effective?

Correct AnswerverifiedShow Answer

There is a substantial safety margin for the uptake of gases in the alveolus because at rest, blood is completely oxygenated after traveling only 1/3 the length of the pulmonary capillary bed.

Correct AnswerverifiedShow Answer

Assuming resting conditions at sea level, what is the partial pressure of carbon dioxide in pulmonary veins?

Correct AnswerverifiedShow Answer

The blood in the pulmonary vein is called mixed venous blood.

Correct AnswerverifiedShow Answer

Which of the following will increase the unloading of oxygen within the tissue?

Correct AnswerverifiedShow Answer

As oxygen binds to hemoglobin, the___________ of the hemoglobin molecule will change through a process of ________such that the binding of oxygen is enhanced.

Correct AnswerverifiedShow Answer

Which of the following does NOT contribute to the rapid movement of gases into and out of the blood within the lungs?

Correct AnswerverifiedShow Answer

What is an increase in alveolar ventilation to match the demands of increased metabolic activity in the cells called?

Correct AnswerverifiedShow Answer

Chemoreceptors respond primarily to changes in PCO2 indirectly by its effect on

Correct AnswerverifiedShow Answer

What percentage of oxygen is transported by hemoglobin?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedIn the blood, carbon dioxide is stored i...View AnswerShow Answer

Hyperpnea describes the increase in ventilation that occurs to meet an increase in metabolic demands of the tissues.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Hemoglobin can bind O₂, CO₂and H⁺all at the same time.

Correct Answer
verified

Correct Answer
verified

Hyperventilation will cause changes in P_CO₂that are detected by the chemoreceptors which causes a(n)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

As oxygen binds to hemoglobin, the___ of the hemoglobin molecule will change through a process of such that the binding of oxygen is enhanced.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Chemoreceptors respond primarily to changes in P_CO₂indirectly by its effect on

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
In the blood, carbon dioxide is stored i...
View Answer

Correct Answer
verified