Question 1

STPD refers to standard conditions of

Accepted Answer

A)  0o K, 1 atm and saturated with water vapor 
B)  0o K, 1 atm and no w ater vapor 
C)  0o C, 1 atm and no water vapor 
D)  37o C, 1 atm and no water vapor 
E)  37oC, 1 atm and saturated with water vapor 
A)  0o K, 1 atm and saturated with water vapor 
B)  0o K, 1 atm and no w ater vapor 
C)  0o C, 1 atm and no water vapor 
D)  37o C, 1 atm and no water vapor 
E)  37oC, 1 atm and saturated with water vapor C

Question 2

The vapor pressure of water at the boiling point of water is

Accepted Answer

A)  760 mm Hg 
B)  47 mm Hg 
C)  Atmospheric pressure or am bient pressure 
D)  713 mm Hg 
E)  Cannot be determined from the information given 
A)  760 mm Hg 
B)  47 mm Hg 
C)  Atmospheric pressure or am bient pressure 
D)  713 mm Hg 
E)  Cannot be determined from the information given C

Question 3

Gas movement is down its

Accepted Answer

A)  Absolute concentration gradient 
B)  Partial pressure gradient 
C)  Total pressure gradient 
D)  Oncotic pressure gradient 
E)  Velocity of fluid flow gradient 
A)  Absolute concentration gradient 
B)  Partial pressure gradient 
C)  Total pressure gradient 
D)  Oncotic pressure gradient 
E)  Velocity of fluid flow gradient B

Question 4

The respiratory quotient is the ratio

Accepted Answer

A)  TV / TLC 
B)  FEV1 / VC 
C)  DLO2 / DLCO2 
D)  PACO2 / PAO2 
E)  QCO2 / QO2 
A)  TV / TLC 
B)  FEV1 / VC 
C)  DLO2 / DLCO2 
D)  PACO2 / PAO2 
E)  QCO2 / QO2

Question 5

The respiratory quotient is typically about

Accepted Answer

A)  1.0 
B)  0.8 
C)  0.7 
D)  200 
E)  250 
A)  1.0 
B)  0.8 
C)  0.7 
D)  200 
E)  250

Question 6

At body tem perature, the vapor pressure of water is

Accepted Answer

A)  760 mm Hg 
B)  713 mm Hg 
C)  600 mm Hg 
D)  160 mm Hg 
E)  47 mm Hg 
A)  760 mm Hg 
B)  713 mm Hg 
C)  600 mm Hg 
D)  160 mm Hg 
E)  47 mm Hg

Question 7

The anatomic dead space is

Accepted Answer

A)  The volume of gas that fills the non-exchanging airways 
B)  The volume of gas that does not exchange with blood 
C)  The volume of gas left in the lungs after a forceful expiration 
D)  Greater than the physiological dead space 
E)  The volume of gas that doesn’t move with ventilation 
A)  The volume of gas that fills the non-exchanging airways 
B)  The volume of gas that does not exchange with blood 
C)  The volume of gas left in the lungs after a forceful expiration 
D)  Greater than the physiological dead space 
E)  The volume of gas that doesn’t move with ventilation

Question 8

Which has the grea test solubility in water?

Accepted Answer

A)  O2 
B)  N2 
C)  CO₂ 
D)  CO 
E)  All of the m hav e the sam e so lubility 
A)  O2 
B)  N2 
C)  CO₂ 
D)  CO 
E)  All of the m hav e the sam e so lubility

Question 9

Exchange of gas between alveolar air and blood is rapid because

Accepted Answer

A)  The surface area for exchange is large 
B)  Gasses diffuse incredibly fast 
C)  The diffusion distance is small 
D)  The gradients for diffusion are large 
E)  Both A and C are true 
A)  The surface area for exchange is large 
B)  Gasses diffuse incredibly fast 
C)  The diffusion distance is small 
D)  The gradients for diffusion are large 
E)  Both A and C are true

Question 10

An expired tidal volume is 0.5 L a t BT PS . Its volume at STPD is

Accepted Answer

A)  350 mL 
B)  605 mL 
C)  413 mL 
D)  469 mL 
E)  289 mL 
A)  350 mL 
B)  605 mL 
C)  413 mL 
D)  469 mL 
E)  289 mL

Question 11

The diffusing capacity of the lungs for CO2 is much higher than the diffusing capacity for O2 because

Accepted Answer

A)  The diffusion coefficient for CO2 is so much higher than that of O2 
B)  The area available for CO2 is greater because it can go through lipid membranes 
C)  CO2 dissolves in water much better 
D)  The gradient for CO2 diffusion is less 
E)  Capillaries open up to make the diffusing capacity greater 
A)  The diffusion coefficient for CO2 is so much higher than that of O2 
B)  The area available for CO2 is greater because it can go through lipid membranes 
C)  CO2 dissolves in water much better 
D)  The gradient for CO2 diffusion is less 
E)  Capillaries open up to make the diffusing capacity greater

Question 12

The alveolar ventilation equation is

Accepted Answer

A)  QA =VR (VT-Vd) 
B)  PA = fA (PB - PH2O) 
C) [A] = $\alpha$A PA 
D)  QA = QCO2 (PB - PH2O) / PACO2 
E)  PAO2 = PIO2 - PACO2/R + fIO2 PACO2 [(1-R)/R] 
A)  QA =VR (VT-Vd) 
B)  PA = fA (PB - PH2O) 
C) [A] = $\alpha$A PA 
D)  QA = QCO2 (PB - PH2O) / PACO2 
E)  PAO2 = PIO2 - PACO2/R + fIO2 PACO2 [(1-R)/R]

Question 13

The partial pressure of an ideal gas is

Accepted Answer

A)  The mole fraction of the gas times the total pressure 
B)  The pressure of the gas per mole 
C)  The pressure of the gas per molecule 
D)  The pressure of the gas divided by the partial molar volume 
E)  The pressure the gas would have if it was at STPD 
A)  The mole fraction of the gas times the total pressure 
B)  The pressure of the gas per mole 
C)  The pressure of the gas per molecule 
D)  The pressure of the gas divided by the partial molar volume 
E)  The pressure the gas would have if it was at STPD

Question 14

The diffusing capacity has units of

Accepted Answer

A)  cm2 s-1 
B)  mL dL -1 
C)  Pa s 
D)  Mol s -1 cm -2 
E)  mL  min-1 mm Hg -1 
A)  cm2 s-1 
B)  mL dL -1 
C)  Pa s 
D)  Mol s -1 cm -2 
E)  mL  min-1 mm Hg -1

Question 15

Alveolar gas partial pressures at rest

Accepted Answer

A)  Are relatively constant because the tidal volume is a small fraction of the FRC 
B)  Vary widely during each breath because fresh air replaces “stale” alveolar air during each
breath 
C)  Vary widely because the blood squirts through unevenly during each ejection cycle of the
heart 
D)  Are the sam e as those in moist tracheal air 
E)  Are relatively constant because the tidal volume is a small fraction of the TLC 
A)  Are relatively constant because the tidal volume is a small fraction of the FRC 
B)  Vary widely during each breath because fresh air replaces “stale” alveolar air during each
breath 
C)  Vary widely because the blood squirts through unevenly during each ejection cycle of the
heart 
D)  Are the sam e as those in moist tracheal air 
E)  Are relatively constant because the tidal volume is a small fraction of the TLC

Question 16

The vapor pressure of water

Accepted Answer

A)  Depends on the ambient pressure 
B)  Depends on the temperature of the water 
C)  Varies with the composition of the gas phase 
D)  Is greatest for N2 
E)  Is greatest for O2 
A)  Depends on the ambient pressure 
B)  Depends on the temperature of the water 
C)  Varies with the composition of the gas phase 
D)  Is greatest for N2 
E)  Is greatest for O2

Question 17

If glucose is the only fuel used for energy supply, the respiratory quotient would be

Accepted Answer

A)  1.0 
B)  0.7 
C)  0.8 
D)  0.83 
E)  6 
A)  1.0 
B)  0.7 
C)  0.8 
D)  0.83 
E)  6

Question 18

A person inspires dry air. The N2 partial pressure in moist tracheal air should be

Accepted Answer

A)  The same as in dry inspired air because N2 does not exchange 
B)  The same as in dry inspired air because the water vapor merely increases the total
pressure 
C)  Less than that in dry inspired air because water vapor dilutes all of the gasses 
D)  More than that in dry inspired air because oxygen is rem oved from the tracheal air 
E)  Unaffected by anything because N2 is inert to bodily metabolism 
A)  The same as in dry inspired air because N2 does not exchange 
B)  The same as in dry inspired air because the water vapor merely increases the total
pressure 
C)  Less than that in dry inspired air because water vapor dilutes all of the gasses 
D)  More than that in dry inspired air because oxygen is rem oved from the tracheal air 
E)  Unaffected by anything because N2 is inert to bodily metabolism

Question 19

The ideal gas equation is

Accepted Answer

A)  PA = fA (PB -47) 
B)  R = QCO2 / QO2 
C)  PV = nRT 
D)  XA = $\beta$APA 
E)  [A] = $\alpha$A PA 
A)  PA = fA (PB -47) 
B)  R = QCO2 / QO2 
C)  PV = nRT 
D)  XA = $\beta$APA 
E)  [A] = $\alpha$A PA

Question 20

Henry’s Law is best described as

Accepted Answer

A)  QA = VR (VT - V
D)  
B)  PA = fA (PB - PH2O) 
C)  [A] = $\alpha$A PA 
D)  QA = QCO2 (PB - PH2O) / PACO2 
E)  PAO2 = PIO2 - PACO2/R + fIO2 PACO2 [(1-R)/R] 
A)  QA = VR (VT - V
D)  
B)  PA = fA (PB - PH2O) 
C)  [A] = $\alpha$A PA 
D)  QA = QCO2 (PB - PH2O) / PACO2 
E)  PAO2 = PIO2 - PACO2/R + fIO2 PACO2 [(1-R)/R]

Exam 47: Gas Exchange in the Lung

STPD refers to standard conditions of

The vapor pressure of water at the boiling point of water is

Gas movement is down its

The respiratory quotient is the ratio

The respiratory quotient is typically about

At body tem perature, the vapor pressure of water is

The anatomic dead space is

Which has the grea test solubility in water?

Exchange of gas between alveolar air and blood is rapid because

An expired tidal volume is 0.5 L a t BT PS . Its volume at STPD is

The diffusing capacity of the lungs for CO2 is much higher than the diffusing capacity for O2 because

The alveolar ventilation equation is

The partial pressure of an ideal gas is

The diffusing capacity has units of

Alveolar gas partial pressures at rest

The vapor pressure of water

If glucose is the only fuel used for energy supply, the respiratory quotient would be

A person inspires dry air. The N2 partial pressure in moist tracheal air should be

The ideal gas equation is

Henry’s Law is best described as

Physical Foundations Ii: Electrical Force Potential Capacitance and Current

Chemical Foundations I: Chemical Energy and Intermolecular Forces

Chemical Foundations Ii: Concentration and Kinetics

Diffusion

Electrochemical Potential and Free Energy

Cell Structure

Dna and Protein Synthesis

Protein Structure

Biological Membranes

Passive Transport and Facilitated Diffusion

Active Transport: Pumps and Exchangers

Osmosis and Osmotic Pressure

Cell Signaling

ATP Production I: Glycolysis

Atp Production Ii: Tca Cycle and Oxidative Phosphorylation

Atp Production Iii: Fatty Acid Oxidation and Amino Acid Oxidation

Origin of the Membrane Potential

The Action Potential

Propagation of the Action Potential

Skeletal Muscle Mechanics

Contractile Mechanisms in Skeletal Muscle

Neuromuscular Junction and Ec Coupling

Muscle Energetics Fatigue and Training

Smooth Muscle

Organization of the Nervous System

Cells Synapses and Neurotransmitters

Cutaneous Sensory Systems

Spinal Reflexes

Balance and Control of Movement

the Chemical Senses

Hearing

Vision

Autonomic Nervous System

Overview of the Cv System and Blood

Plasma and Red Blood Cells

White Blood Cells and Inflammation

The Heart As a Pump

Cellular Basis of Cardiac Contractility

the Cardiac Function Curve

Vascular Function: Hemodynamics

Microcirculation and Solute Exchange

Regulation of Perfusion

Integration of Cardiac Output and Venous Return

Regulation of Arterial Pressure

Mechanics of Breathing

Lung Volumes and Airway Resistance

Oxygen and Carbon Dioxide Transport

Acid Base Physiology I Bicarbonate Buffers and Respiratory Compensation

Control of Ventilation

Anatomy and Renal Overview

Glomerular Filtration

Tubular Reabsorption and Secretion

Concentration and Dilution of Urine

Mouth and Esophagus

The Stomach

Intestinal and Colonic Motility

Pancreatic and Biliary Secretion

Digestion and Absorption of the Macronutrients

Energy Balance and Regulation of Food Intake

The diffusing capacity of the lungs for CO₂ is much higher than the diffusing capacity for O₂ because

A person inspires dry air. The N₂ partial pressure in moist tracheal air should be