gas transport and pulmonary blood flow Flashcards
1
Q
why does oxygen need to be carried by haemoglobin
A
oxygen poorly soluble in plasma so needs an alternative methos of carriage to deliver required amount of the body
2
Q
what does oxygen content depend on
A
oxygen capacity and the PAO2
3
Q
how much oxygen can 1L blood leaving the lungs carry
A
200ml
4
Q
how is carbon dioxide carried
A
binds to proteins to make carbamino compounds = 30%
as bicarbonate ions = 65%
dissolved in the plasma =5%
5
Q
what happens to hydrogen
A
can’t diffuse easily out of the erythrocyte
buffered by haemoglobin
6
Q
what are alveolar vessels
A
capillaries running in alveolar septa which participate in gas exchange
7
Q
what are extra-alveolar vessels
A
vessels which move blood to and from the lungs
8
Q
what is the diameter of the blood vessels affected by
A
transmural pressure
9
Q
A
