Ventilation: perfusion relationship Flashcards
1
Q
shunt
A
dilution of oxygenated blood from better ventilated areas
2
Q
alveolar dead space
A
when there is more ventilation than blood flow. air that doesn’t participate. leads to pulmonary vasodilation and bronchial constriction
3
Q
physiologic dead space
A
alveolar dead space plus anatomical dead space
4
Q
anatomical dead space
A
air in airways that have walls too thick for gas exchange
5
Q
both ventilation and perfusion are ____ at base
A
greater
6
Q
what do pulmonary vessels do in response to hypoxia
A
constrict so that the blood is diverted to better ventilated alveoli
7
Q
respiratory sinus arrhythmia
A
acts to minimise ventilation:perfusion mismatch during breath cycle. change in beats per minute
