AVIT 309 TEST 1 EXAM 2025 QUESTIONS
AND ANSWERS
What is the largest cause of fatalities in commercial aviation? - ANS an inappropriate
response response leading to loss of control in flight
Where is the physiological defiant zone? - ANS above 10,000ft
How long does it take a person to acclimate to a location at a higher altitude? - ANS 18 days
per mile
Where is the greatest change in pressure in our atmosphere? - ANS surface to 10,000ft
Boyle's Law - ANS Pressure and volume of a certain amount of gas are constant (explains
trapped gas)
Charles Law - ANS As gas is heated, its volume increases
If the volume is stable the pressure increases (explains variation of pressure gauges in extreme
environments)
Henry's Law - ANS The amount of gas dissolved in a solution is proportional to the partial
pressure of gas over the solutions (explains rapid decompression)
When the pressure drops the gas is supersaturated comes out of solution and bubbles form
1 COPYRIGHT © 2025 SIRJOEL ALL RIGHTS RESERVED
,Dalton's Law - ANS Each component of all gas contributes to the total pressure (explains
hypoxia)
Law of Gaseous Diffusion - ANS Gases will diffuse from higher pressure/concentration to a
low pressure/concentration naturally. Ex. smells spread, smoke diffuses (explains movement of
gas in lungs and blood)
What are the four steps in gas exchange with each cell - ANS Ventilation, Diffusion, Oxygen
Transport, Utilization
What is homeostasis? - ANS the condition compatible with optimum cellular & bodily
function
What in the Red Blood Cell enables it to carry oxygen? - ANS hemoglobin
What factors determine the PAO2? - ANS O2, pressure gradient, CO2, water vapor,
What is the main factor determining amount of O2 absorbed in lungs - ANS Partial pressure
gradient
What are common symptoms of trapped gas problems? - ANS pain
What are common symptoms of decompression sickness? - ANS nitrogen bubbles trying to
escape from a persons body
What is the recommended treatment of hypoxic hypoxia at altitude? - ANS -100% oxygen
with pressure
What is the lower limit of the zone of physiologic deficiency? - ANS 95%- 85%
2 COPYRIGHT © 2025 SIRJOEL ALL RIGHTS RESERVED
, In which of the 10,000 foot intervals is the barometric pressure change the greatest? -
ANS sea level - 10000 ft
Define the zone of physiologic deficiency? - ANS unable to function without some type of life
support
What is effective performance time? - ANS its the time from the first point you start getting
hypoxic until you can no longer perform tasks
Which toxin has the highest incidence of presence in smoke from aircraft fires? - ANS carbon
monoxide
Which toxin causes histotoxic hypoxia? - ANS carbon monoxide, cyanide, narcotics, alcohol
Which gas level in a person's blood will change the most as a result from hyperventilating? -
ANS carbon dioxide
Which law describes how nitrogen in your body tissues will come out of solution (in the form of
bubbles) with decreasing pressure? - ANS henry's law
Which oxygen delivery system will best protect the user in a toxic exposure emergency? -
ANS pressure and diluted demand regulator
What causes an aircraft cabin flashover? - ANS when combustible gases gases ignite at 400
deg F causing the temp in cabin to climb to 1200+ degrees F
Name several cases that are primarily surface irritants: affecting the eyes, nose, mouth, throat
and lungs? - ANS aerosolized gases, burn hydraulic fluid oil, CO, cyanide
3 COPYRIGHT © 2025 SIRJOEL ALL RIGHTS RESERVED
AND ANSWERS
What is the largest cause of fatalities in commercial aviation? - ANS an inappropriate
response response leading to loss of control in flight
Where is the physiological defiant zone? - ANS above 10,000ft
How long does it take a person to acclimate to a location at a higher altitude? - ANS 18 days
per mile
Where is the greatest change in pressure in our atmosphere? - ANS surface to 10,000ft
Boyle's Law - ANS Pressure and volume of a certain amount of gas are constant (explains
trapped gas)
Charles Law - ANS As gas is heated, its volume increases
If the volume is stable the pressure increases (explains variation of pressure gauges in extreme
environments)
Henry's Law - ANS The amount of gas dissolved in a solution is proportional to the partial
pressure of gas over the solutions (explains rapid decompression)
When the pressure drops the gas is supersaturated comes out of solution and bubbles form
1 COPYRIGHT © 2025 SIRJOEL ALL RIGHTS RESERVED
,Dalton's Law - ANS Each component of all gas contributes to the total pressure (explains
hypoxia)
Law of Gaseous Diffusion - ANS Gases will diffuse from higher pressure/concentration to a
low pressure/concentration naturally. Ex. smells spread, smoke diffuses (explains movement of
gas in lungs and blood)
What are the four steps in gas exchange with each cell - ANS Ventilation, Diffusion, Oxygen
Transport, Utilization
What is homeostasis? - ANS the condition compatible with optimum cellular & bodily
function
What in the Red Blood Cell enables it to carry oxygen? - ANS hemoglobin
What factors determine the PAO2? - ANS O2, pressure gradient, CO2, water vapor,
What is the main factor determining amount of O2 absorbed in lungs - ANS Partial pressure
gradient
What are common symptoms of trapped gas problems? - ANS pain
What are common symptoms of decompression sickness? - ANS nitrogen bubbles trying to
escape from a persons body
What is the recommended treatment of hypoxic hypoxia at altitude? - ANS -100% oxygen
with pressure
What is the lower limit of the zone of physiologic deficiency? - ANS 95%- 85%
2 COPYRIGHT © 2025 SIRJOEL ALL RIGHTS RESERVED
, In which of the 10,000 foot intervals is the barometric pressure change the greatest? -
ANS sea level - 10000 ft
Define the zone of physiologic deficiency? - ANS unable to function without some type of life
support
What is effective performance time? - ANS its the time from the first point you start getting
hypoxic until you can no longer perform tasks
Which toxin has the highest incidence of presence in smoke from aircraft fires? - ANS carbon
monoxide
Which toxin causes histotoxic hypoxia? - ANS carbon monoxide, cyanide, narcotics, alcohol
Which gas level in a person's blood will change the most as a result from hyperventilating? -
ANS carbon dioxide
Which law describes how nitrogen in your body tissues will come out of solution (in the form of
bubbles) with decreasing pressure? - ANS henry's law
Which oxygen delivery system will best protect the user in a toxic exposure emergency? -
ANS pressure and diluted demand regulator
What causes an aircraft cabin flashover? - ANS when combustible gases gases ignite at 400
deg F causing the temp in cabin to climb to 1200+ degrees F
Name several cases that are primarily surface irritants: affecting the eyes, nose, mouth, throat
and lungs? - ANS aerosolized gases, burn hydraulic fluid oil, CO, cyanide
3 COPYRIGHT © 2025 SIRJOEL ALL RIGHTS RESERVED
