Question 1

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

Question 2

The buffering capacity of hemoglobin is directly related to its ability to bind with

Accepted Answer

A)  nitrogen.
B)  carbon monoxide.
C)  oxygen.
D)  hydrogen ions.
E)  carbon dioxide.

Question 3

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

Accepted Answer

A) True 
 B)False

Question 4

The affinity of hemoglobin for oxygen can be altered to enhance the loading or unloading of oxygen. Describe the changes within the lungs that facilitate the loading of oxygen onto the hemoglobin (and the mechanisms by which oxygen binding to hemoglobin is altered by these changes).

Accepted Answer

In the lung, the hemoglobin- oxygen diss...

Question 5

What is the most abundant gas in the air that we breathe?

Accepted Answer

A)  carbon dioxide
B)  water vapor
C)  hydrogen
D)  nitrogen
E)  oxygen

Question 6

At the same partial pressure, all gases in a solution will be at equal concentration.

Accepted Answer

A) True 
 B)False

Question 7

The respiratory quotient is calculated as the

Accepted Answer

A)  sum of the volume of oxygen consumed and the volume of carbon dioxide produced.
B)  product of the volume of oxygen consumed and the volume of carbon dioxide produced.
C)  ratio of the volume of oxygen consumed per volume of carbon dioxide produced.
D)  ratio of the volume of carbon dioxide produced per volume of oxygen consumed.
E)  product of the volume of carbon dioxide consumed and the volume of oxygen produced.

Question 8

A respiratory acidosis is cause by increased carbon dioxide within the blood.

Accepted Answer

A) True 
 B)False

Question 9

Over a period of time and under resting conditions, the amount of carbon dioxide generated by the body is greater than the amount of oxygen the body consumes.

Accepted Answer

A) True 
 B)False

Question 10

Peripheral chemoreceptors are specialized cells in contact with arterial blood that respond directly to changes in blood

Accepted Answer

A)  pH.
B)  PO2.
C)  PCO2.
D)  PCO2 and PO2.
E)  PO2, pH, and PCO2.

Question 11

At sea level, if oxygen is consumed by the body cells at a rate of 300 mL per minute, then how much oxygen diffuses from the alveoli into the blood in the pulmonary capillaries?

Accepted Answer

A)  300 mL per minute
B)  more than 300 mL per minute
C)  less than 300 mL per minute
D)  It depends on where the oxygen is being utilized.
E)  It depends on whether or not carbon dioxide is being produced at the same rate.

Question 12

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

Accepted Answer

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

Question 13

Which of the following can increase the concentration of a particular gas in a solution?

Accepted Answer

A)  Increase the partial pressure of that gas exposed to the solution.
B)  Decrease the concentration of other gases in the solution.
C)  Increase the volume of the container containing the gas and solution.
D)  Increase the volume of the gas only.
E)  Increase the volume of the solution only.

Question 14

Carbaminohemoglobin is hemoglobin with carbon dioxide bound to it.

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

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

Question 16

The affinity of hemoglobin for oxygen can be altered to enhance the loading or unloading of oxygen. Describe the changes in active muscle that facilitate the unloading of oxygen from hemoglobin (and the mechanisms by which oxygen binding to hemoglobin is altered by these changes).

Accepted Answer

In active muscle, the hemoglobin- oxygen...

Question 17

A decrease in the affinity of oxygen for hemoglobin is reflected as a _ shift in the hemoglobin- oxygen dissociation curve, which would facilitate the _ of oxygen.

Accepted Answer

A)  rightward : loading
B)  rightward : unloading
C)  leftward : loading
D)  neutral : loading
E)  leftward : unloading

Question 18

What is a decrease in carbon dioxide within the blood called?

Accepted Answer

A)  hypocapnia
B)  hypercapnia
C)  hyperpnea
D)  hypoxia
E)  hypoxemia

Question 19

Which statement best describes why O2 and CO2 can both be exchanged simultaneously at the alveoli and pulmonary capillaries?

Accepted Answer

A)  Blood in the pulmonary capillaries is high in both O2 and CO2.
B)  Blood in both the alveoli and pulmonary capillaries is at equilibrium.
C)  Blood in the alveoli is high in both O2 and CO2.
D)  Nitrogen is at a high pressure in both the alveoli and pulmonary capillaries and drives the exchange of O2 and CO2.
E)  Each gas acts independently and diffuses down its own partial pressure gradient.

Question 20

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

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

What is a decrease in carbon dioxide within the blood called?

Correct AnswerverifiedShow Answer

Over a period of time and under resting conditions, the amount of carbon dioxide generated by the body is greater than the amount of oxygen the body consumes.

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

A respiratory acidosis is cause by increased carbon dioxide within the blood.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The respiratory quotient is calculated as the

Correct AnswerverifiedShow Answer

Carbaminohemoglobin is hemoglobin with carbon dioxide bound to it.

Correct AnswerverifiedShow Answer

What is the most abundant gas in the air that we breathe?

Correct AnswerverifiedShow Answer

Peripheral chemoreceptors are specialized cells in contact with arterial blood that respond directly to changes in blood

Correct AnswerverifiedShow Answer

The affinity of hemoglobin for oxygen can be altered to enhance the loading or unloading of oxygen. Describe the changes in active muscle that facilitate the unloading of oxygen from hemoglobin (and the mechanisms by which oxygen binding to hemoglobin is altered by these changes).

Correct AnswerverifiedIn active muscle, the hemoglobin- oxygen...View AnswerShow Answer

At sea level, if oxygen is consumed by the body cells at a rate of 300 mL per minute, then how much oxygen diffuses from the alveoli into the blood in the pulmonary capillaries?

Correct AnswerverifiedShow Answer

A decrease in the affinity of oxygen for hemoglobin is reflected as a _ shift in the hemoglobin- oxygen dissociation curve, which would facilitate the _ of oxygen.

Correct AnswerverifiedShow Answer

At the same partial pressure, all gases in a solution will be at equal concentration.

Correct AnswerverifiedShow Answer

The affinity of hemoglobin for oxygen can be altered to enhance the loading or unloading of oxygen. Describe the changes within the lungs that facilitate the loading of oxygen onto the hemoglobin (and the mechanisms by which oxygen binding to hemoglobin is altered by these changes).

Correct AnswerverifiedIn the lung, the hemoglobin- oxygen diss...View AnswerShow Answer

Which of the following can increase the concentration of a particular gas in a solution?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which statement best describes why O2 and CO2 can both be exchanged simultaneously at the alveoli and pulmonary capillaries?

Correct AnswerverifiedShow Answer

The buffering capacity of hemoglobin is directly related to its ability to bind with

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

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

Correct Answer
verified

Correct Answer
verified
In active muscle, the hemoglobin- oxygen...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
In the lung, the hemoglobin- oxygen diss...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified