Lecture 18: Gas Exchange: CO2 Flashcards

1
Q

2 ways O2 is transported

A

dissolved in plasma (1.5%)

bound to hemoglobin protein (98.5%)

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2
Q

extent to which O2 binds to hemo depends on

A

PO2 in plasma

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3
Q

def of oxy-hemoglobin dissociation curve

A

relationship between extent of oxygen binding to hemo and PO2

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4
Q

lung PO2 is _____ than PO2 in blood

A

greater

so O2 goes into blood

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5
Q

factors that affect oxyhemoglobin dissociation curve

A

temperature
Blood pH
PCO2

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6
Q

Bohr shift definition

A

curve shifts right

hemoglobin molec will RELEASE MORE oxygen at any PO2

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7
Q

Bohr shift caused by

A

reduction in blood pH
increase in blood CO2
inc in temp

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8
Q

when blood pH reduced

A

tissue more acidic

release more O2

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9
Q

Higher temperature

A

fluid is warmer

less CO2

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10
Q

Bohr shift is most important at

A

tissue capillaries

hemoglobin here will release O2 more readily

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11
Q

High blood pH value

A

7.6

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12
Q

Low blood pH value

A

7.2

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13
Q

normal blood pH value

A

7.4

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14
Q

X axis of graph

A

PO2

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15
Q

Y axis

A

% sat of hemoglobin

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16
Q

when blood pH high

A

hold onto more oxygen

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17
Q

when pH low

A

Bohr shift

release more O2

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18
Q

When low blood PCO2

A

hold onto more O2

19
Q

When high blood PCO2

A

release more O2

20
Q

110 degrees

A

too hot

death

21
Q

low temperature

A

hold onto more O2

22
Q

high temp

A

release more O2

23
Q

Fully saturated hemoglobin can bind

A

1.34 mL oxygen

24
Q

adults have this much hemoglobin

A

men: 160 g/L blood
women: 140-150 g/L blood

25
arterial blood in healthy person is _____% saturated
100
26
O2 conc= (equation)
g hemoglboin X 1.34 mL O2
27
O2 conc for men (Number)
213.3 mL O2/L blood | 160g Hb/L X 1.34 mL O2/g HB
28
anemia
low blood hemoglobin conc
29
hypoxia
``` low blood O2 low hemoglobin sat is a STATE don't have to be anemic to be hypoxic can result from holding breath ```
30
Carbon Monoxide Poisoning
binds to Hb 250X better than O2 treatment: pure O2 BUT: must wait for CO bound Hb to be replaced by body takes time
31
CO2 from tissue moves...
from active tissue cells to plasma to RBCs
32
2 things formed in RBCs for CO2 transport
H2CO3 (carbonic acid) and carbaminohemoglobin
33
70% CO2 transported in plasma is
bicarbonate ions
34
23% CO2 transported in plasma is
carbaminohemoglobin
35
7% CO2 transported in plasma is
disolved in plasma
36
Oxygen loading at pulm cap
is time dependent
37
oxygen loading at pulm caps depends on
rate of gas difussion and rate of blood flow through pulm caps transit time
38
complete diffusion of O2 in most alveolar-cap units takes
0.25 secs (healthy)
39
transit time at rest is
0.8 secs
40
chloride shift across RBC
systemic caps | internal resp
41
reverse chloride shift across RBC
pulmonary caps | external resp
42
external respiration across RBCs
pulmonary caps | reverse chloride shift
43
internal respiration across RBCs
systemic caps | chloride shift
44
point of cholride shift
to load up plasma with bicarbonate