Respiratory 6 Flashcards
What circulation receives less than 2% of cardiac output? And response to hypoxia is vasodilation?
Bronchial circulation
Bronchial vessels also provide ________ circulation to the lungs when the pulmonary arterial supply is inadequate
Collateral
What is alveolar gas composition and exchange determined by?
Partial pressures of gases
PO2 values change due to:
1) changes in __________ pressure
2) Presence of ______ vapor
Atmospheric
Water
FO2 is the _____ at hight altitudes, but atmospheric pressure decreases as PO2 decreases
Same
What is alveolar air CO2:
If CO2 production increases = alveolar ventilation ___________
If VCO2 remains uchanged, but VA halves, the PaCO2 __________
Increases
Doubles
Alveolar air O2:
PaO2 is lower than PO2 in inspired air because its ________ consumed
O2 consumption is in function of the _____ produced and the type of fuel metabolized
Constantly
CO2
PaO2 is determined by the PiO2 and the change for O2 for _____
CO2
If PaCO2 increases, PaO2 _______
Decreases
PaO2 is used to compare causes of ________
Hypoxemia
What is the state of low partial pressure of O2 in arterial blood (PaO2) and is one of the major causes of hypoxia?
Hypoxemia
What is a decrease in alveolar ventilation in relation to CO2 production -> accumulation of CO2 in alveoli -> displacement of alveolar O2?
Alveolar hypo ventilation
What is the state of inadequate levels of O2 reaching the TISSUE?
Hypoxia
What are these causes of:
Alveolar hypoventialtion
Diffusion impairment
Right to left shunts
Low ventilation to perfusion rate
Intense exercise in elite athletes?
Hypoxemia
Gas exchange in the respiratory system refers to _________ of O2 and CO2 in the lungs and peripheral tissue
Diffusion
