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Ap2 Exam 3 Respiratory Physiology With Questions And Correct Answers Latest Version
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Ap2 Exam 3 Respiratory Physiology With Questions And Correct Answers Latest Version
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Ap2 Exam 3: Respiratory Physiology WithQuestions And Correct Answers Latest
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Gas laws: explain Boyles law Answer: it explains how air comes in/pulmonary ventilation
P1V1=P2V2
as pressure increases, volume decreases
as volume increases, pressure decreases
Gas laws: explain Dalton's law of partial pressure Answer: total pressure exerted by mixture of gases
is equal to the sum of pressures exerted by each gas
what is partial pressure? Answer: pressure exerted by each gas in a mixture, that is directly
proportional to its percentage in a mixture
Nitrogen makes up approx. 78.6% of air. what is the partial pressure of Nitrogen (PN2)? Answer:
0.786 x 760 mmHg = 597 mmHg
Oxygen makes up 20.9% of air. what is the partial pressure of Oxygen (PO2)? Answer: 0.209 x 760
mmHg = 159 mmHg
what happens to partial pressure at high altitudes? Answer: it decreases
what happens to partial pressure at low altitudes? Answer: it increases significantly
2024
, ex. underwater
Gas laws: explain Henry's law of concentration Answer: concentration = partial pressure x solubility
what influences the amount of each gas to dissolve in a mixture? (henrys law) Answer: 1. solubility
of gas
2. temperature
how much more soluble is CO2 in H2O than O2 in H2O? (henrys law) Answer: CO2 = 20x more
soluble in H2O than O2
what happens to gas solubility if temperature rises? (henrys law) Answer: gas solubility decreases
Define pulmonary ventilation Answer: Mechanical process that depends on volume changes in
thoracic cavity
What are the 2 main mechanisms associated with pulmonary ventilation? Answer: Inspiration
(gases flowing INTO lungs)
Expiration (gases EXIT lungs)
Atmospheric Pressure (Patm) Answer: Pressure exerted by air surrounding the body at sea level
What is 1 atm? Answer: 760 mmHg
What are the 3 respiratory pressures described relative to Patm? Answer: 1. Negative resp. pressure
= LESS THAN Patm
2. Positive resp. pressure = GREATER THAN Patm
2024
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