EXSC 330 Chapter 13 Test With Correct Solution
The body's supply of O2 depends on its ________ and ________ in ambient air. - ANSWER
concentration and pressure
What is ambient air pressure at sea level? - ANSWER 760 mmHg
What is the partial pressure equation? - ANSWER % of concentration x pressure of a gas
mixture
What is Dalton's Law? - ANSWER Total Pressure = sum of partial pressure of all gases in
a mixture
What three gases are present in ambient air? Name their percentages as well. -
ANSWER O2 (20.93%), CO2 (0.03%), and N2 (79.04%)
By how much is PO2 reduced by due to water vapor? - ANSWER 10 mmHg
What is average alveolar PO2? - ANSWER 103 mmHg
What is Henry's Law? - ANSWER gases diffuse from high pressure to low pressure
What 2 things does diffusion rate into a fluid depend on? - ANSWER Pressure differential
and solubility of the gas in the fluid
T/F O2 is more soluble in fluid than CO2. - ANSWER False
T/F Gas exchange between lungs, blood, and tissues occurs actively. - ANSWER False
PO2 in pulmonary capillaries is ________. - ANSWER 40 mmHg
PCO2 in pulmonary capillaries is ________. - ANSWER 46 mmHg
PCO2 in the alveoli is ________. - ANSWER 39 mmHg
T/F Arterial blood leaving lungs always has a PO2 of 100 mmHg and a PCO2 of 40 mmHg
- ANSWER False
In vigorous exercise, PO2 falls towards ________ and PCO2 may approach ________. -
ANSWER 0; 90
Name the 2 things gas transfer capacity may be impaired by. - ANSWER Thickening of
alveolar membrane and reduction in alveolar surface area
Which of the following is NOT a mechanism of O2 transport - ANSWER Plasma
bicarbonate
How many mLs of O2 is dissolve in 5L of total blood volume? - ANSWER 15
The body's supply of O2 depends on its ________ and ________ in ambient air. - ANSWER
concentration and pressure
What is ambient air pressure at sea level? - ANSWER 760 mmHg
What is the partial pressure equation? - ANSWER % of concentration x pressure of a gas
mixture
What is Dalton's Law? - ANSWER Total Pressure = sum of partial pressure of all gases in
a mixture
What three gases are present in ambient air? Name their percentages as well. -
ANSWER O2 (20.93%), CO2 (0.03%), and N2 (79.04%)
By how much is PO2 reduced by due to water vapor? - ANSWER 10 mmHg
What is average alveolar PO2? - ANSWER 103 mmHg
What is Henry's Law? - ANSWER gases diffuse from high pressure to low pressure
What 2 things does diffusion rate into a fluid depend on? - ANSWER Pressure differential
and solubility of the gas in the fluid
T/F O2 is more soluble in fluid than CO2. - ANSWER False
T/F Gas exchange between lungs, blood, and tissues occurs actively. - ANSWER False
PO2 in pulmonary capillaries is ________. - ANSWER 40 mmHg
PCO2 in pulmonary capillaries is ________. - ANSWER 46 mmHg
PCO2 in the alveoli is ________. - ANSWER 39 mmHg
T/F Arterial blood leaving lungs always has a PO2 of 100 mmHg and a PCO2 of 40 mmHg
- ANSWER False
In vigorous exercise, PO2 falls towards ________ and PCO2 may approach ________. -
ANSWER 0; 90
Name the 2 things gas transfer capacity may be impaired by. - ANSWER Thickening of
alveolar membrane and reduction in alveolar surface area
Which of the following is NOT a mechanism of O2 transport - ANSWER Plasma
bicarbonate
How many mLs of O2 is dissolve in 5L of total blood volume? - ANSWER 15
