Pkjojkp Flashcards
(8 cards)
1
Q
Pulmonary vasoconstriction occurs due to?
A
Reduced alveolar PaO₂
2
Q
The predominant stimulus for hypoxic pulmonary vasoconstriction is?
A
Decreased alveolar PaO₂
3
Q
Systemic hypoxia causes pulmonary arteriolar?
A
Constriction
4
Q
Why does hypoxic pulmonary vasoconstriction occur?
A
Due to oxygen-sensitive potassium (K⁺) channels in pulmonary arteries
5
Q
Mechanism of hypoxic pulmonary vasoconstriction?
A
O₂-sensing K⁺ channels in pulmonary arterial smooth muscle cells
6
Q
Which of the following occurs at high altitude?
A
Pulmonary vasoconstriction
7
Q
What happens when a person travels from sea level to 5000 m altitude?
A
Pulmonary vasoconstriction
8
Q
What causes increased pulmonary vasoconstriction?
A
High altitude (due to decreased PaO₂)
