RESPIRATORY SYSTEM PHGY 216
EXAM QUESTIONS & ANSWERS
muscles of inspiration - Correct Answers -diaphragm and external intercostals
muscles of expiration - Correct Answers -internal intercostals and abdominal muscles
**only recruited under certain situations
flow formula - Correct Answers -change in pressure/resistance
Pb - Correct Answers -atmospheric pressure
Pa - Correct Answers -arterial partial pressure
Ppl - Correct Answers -pleural pressure
Ptp - Correct Answers -transpulmonary pressure- difference between alveolar and plural
pressure
why do we measure pressure in cmH20 - Correct Answers -for bulk flow of small
amounts
partial pressure is used for partial pressure of gasses and diffusion
2 factor sof elastic recoil - Correct Answers -surfactant and elastin fibres
how surfactant works - Correct Answers -disperses water molecules so they have less
of a collapsing effect
law of la place - Correct Answers -tension is proportional to radius
therefore smaller alveoli need to increase their surfactant production
la place law formula - Correct Answers -collapsing pressure = 2T/r
what is the pressure ratio between Pa and Pb for inflow of air - Correct Answers -pa< pb
what variable do we change to initiate air flow in and out of the lungs - Correct Answers
-Pl (increase or decrease the size of the lungs)
what are the pressure states before inspiration - Correct Answers -Pa =Pb
EXAM QUESTIONS & ANSWERS
muscles of inspiration - Correct Answers -diaphragm and external intercostals
muscles of expiration - Correct Answers -internal intercostals and abdominal muscles
**only recruited under certain situations
flow formula - Correct Answers -change in pressure/resistance
Pb - Correct Answers -atmospheric pressure
Pa - Correct Answers -arterial partial pressure
Ppl - Correct Answers -pleural pressure
Ptp - Correct Answers -transpulmonary pressure- difference between alveolar and plural
pressure
why do we measure pressure in cmH20 - Correct Answers -for bulk flow of small
amounts
partial pressure is used for partial pressure of gasses and diffusion
2 factor sof elastic recoil - Correct Answers -surfactant and elastin fibres
how surfactant works - Correct Answers -disperses water molecules so they have less
of a collapsing effect
law of la place - Correct Answers -tension is proportional to radius
therefore smaller alveoli need to increase their surfactant production
la place law formula - Correct Answers -collapsing pressure = 2T/r
what is the pressure ratio between Pa and Pb for inflow of air - Correct Answers -pa< pb
what variable do we change to initiate air flow in and out of the lungs - Correct Answers
-Pl (increase or decrease the size of the lungs)
what are the pressure states before inspiration - Correct Answers -Pa =Pb
