Lecture 17: Gas Exchange: O2 Flashcards

1
Q

Dalton’s law

A

gas’s pressure is proportional to its conc

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2
Q

partial pressure

A

pressure exerted by each gas of total gas pressure

partial because of indiv gas when there is more than one

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3
Q

atmopsheric pressure at 2389 ft

A

700 mmHg

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4
Q

Pps of deoxyg blood

A

PO2 40 mmHg

PCO2: 45 mmHg

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5
Q

Pps of oxyg blood

A

PO2: 100 mmHg
PCO2: 40 mmHg

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6
Q

How much fresh air enters with inspiration?

A

about 55mL
mixes w/ FRC (2400 mL)
very little compared to whas already there (FRC)

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7
Q

When fresh air enters, [O2]…

A

inc slightly

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8
Q

When fresh air enters, [CO2]…

A

dec slighltly

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9
Q

When fresh air enters, average alveolar value

A

DOES NOT CHANGE much

constant situation means we have predictable rate of exchange

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10
Q

expired air comparied to inspired air conc

A

lower [O2]

higher [CO2]

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11
Q

why lower [CO2] inspired than expired

A

b/c O2 removed from lungs by blood during inspiration

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12
Q

CO2 movement during breath

A

moves from blood to lungs and is exhaled

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13
Q

gases in lungs (tissue and lung levels)

A

constantly taking O2 out and putting CO2 in

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14
Q

O2 at tissues

A

leaves capps and goes into cells

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15
Q

CO2 at tissues

A

enters caps

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16
Q

venous blood concs

A
high CO2
low O2 (comes into caps at 100, leavs at 40)
17
Q

Fick method

A

O2 consumption= blood flow x (tissue oxygen extraction)
aka C.O. x ([arterial O2] - [mixed venous O2])
most direct and accurate way to measure whole body O2 uptake

18
Q

O2 consumption

A

measured using Fick method

depends on level of activity

19
Q

see slide 10

20
Q

Fick relationship

A

CO2 production measured

values go up (down in O2 one)

21
Q

Fick relationship equation

A

CO2 production= blood flow x (tissue CO2 production)

aka C.O. X ([CO2 mixed venous] - [co2 arterial])

22
Q

O2 concs at rest vs. max

A

rest: 250
max: 3500
more than 10 fold increase

23
Q

CO2 concs at rest vs max

A

rest: 200
max: 3800
close to 20 fold increase

24
Q

amounts of O2 consumed and CO2 produced are

25
respiratory quotient (RQ) equation
amount CO2 made/O2 consumed
26
RQ varies with
nutrient type
27
pure fat RQ
0.7 | 7 mL pure CO2 produced for every 10 mL pure O2 used
28
pure carb RQ
1.0 | CO2 produced and O2 consumed are about equal
29
partial pressuure O2 in atmosphere
21
30
partial pressure N2 in atomsphere
79
31
atomospheric PO2 vs. alveolar PO2
atmosphere: 159 alveoli: 105
32
atomospheric PCO2 vs. alveolar PCO2
atmosphere: 0.3 alveoli: 40
33
why oxygen PP doesn't match between alveolar and oxy blood
nutritient exchange in lung to feed lungs
34
best place to look for mixed venous blood
right ventricle, right atrium, pulmonary artery
35
with oxygen we make
water
36
we get CO2 from
the fuel we use