All of the following are true except
Minute Ventilation = f(tidal volume)
Alveolar Ventilation = f(tidal volume-dead space)
dead space ventilation + alveolar ventilation = Tidal volume
dead space = convert patient's weight in kgs to ml
A 32 yr old male has been running on a treadmill for 15 min. What are the most likely changes in the values below compared to rest?
CO2 Production (VCO2) increases
Alveolar Ventilation increased
PACO2 doesn't change
all of the above are correct
The amount of CO2 produced per minute is <= to the amount of oxygen consumed
RQ (Respiratory Quotient) = ratio of METABOLIC production of CO2 to O2 consumption Whereas Respiratory gas exchange ration R = CO2 production/O2 consumed at the lung
Which of the following statement is false
Hyperventilation means that alveolar ventilation exceeds CO2 production
Hypoventilation means that alveolar ventilation is less than CO2 production
During exercise hyperventilation is normal
all statements are true
When CO2 production doubles the alveolar ventilation doubles
The STPD volumes are about 20% smaller than BTPS. (because water vapor and increased temperature increase the volume of the gas)
Dalton's law of Partial pressures
The total pressure of a mixed gas is the sum of the individual partial pressures of each gas
in air FiO2 never changes but the barometric pressure does change based on the sea level
PB = PO2 + PCO2 + Pwv + PN2
PO2 at sea level = 160 mmHg
All of the above are true
Regarding PO2
In ambient air is 160 mmHg
In bronchioles it is 150 mmHg (because water vapor was added about 10 mmHg so that is subtracted
Alveoli it is 100 mmHg because O2 is diffusing into the blood
all of the above are true
Regarding Dead space all of the following are true except?
Humidifies air
Warms inspired air
removes particulate matter
gas exchange
Increase in Physiologic dead space
PaO2 decreased
PaCO2 increased
P expired CO2 decreased
P expired O2 increased
All of the above are correct
