Respiratory System Structure and Gas Exchange (3B)
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QUESTION
What is the direction of
C
O
2
CO_2
C
O
2
diffusion at the alveolus when
P
a
C
O
2
>
P
A
C
O
2
P_{a CO_2}>P_{A CO_2}
P
a
C
O
2
>
P
A
C
O
2
?
QUESTION
Which variable increases diffusion rate across the alveolar membrane: increased thickness or increased area?
QUESTION
What is the direction of
O
2
O_2
O
2
diffusion at the alveolus when
P
A
O
2
>
P
a
O
2
P_{A O_2}>P_{a O_2}
P
A
O
2
>
P
a
O
2
?
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ANSWER
O
2
O_2
O
2
diffuses from alveoli into pulmonary capillary blood. Gases diffuse down partial pressure gradients, from higher alveolar to lower blood levels.
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