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Boards pt1 > Respiratory physiology > Flashcards

Respiratory physiology Flashcards

1
Q

what part of the lung has the best ventilation perfusion ratio

A

hilum

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2
Q

what part of the lung has very little ventilation

A

apex

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3
Q

TV

A

500ml

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4
Q

IRV

A

3100ml

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5
Q

ERV

A

1200ml

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6
Q

RV

A

1200ml

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7
Q

IC

A

3600ml

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8
Q

FRC

A

2400ml

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9
Q

VC

A

4800ml

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10
Q

TLC

A

6-5 liters

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11
Q

type I aveolar cells in the lung

A

squamous (gas exchange)

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12
Q

type II aveolar cells in the lung make

A

[surfactant] phospholipids (dec. surface tension)

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13
Q

what keeps the lungs expanded decreasing surface tension

A

lipoprotein

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14
Q

hyaline membrane disease

A

no surfactant

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15
Q

during inspiration

A

diaphragm contracts and decreased pressure move air into lungs

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16
Q

decreased intrapleural pressure =

A

inspiration

17
Q

partial pressure in alveoli is controlled by

A
  1. rate of absorption of oxygen into the blood

2. rate of entry of new oxygen into the lungs

18
Q

what turns off inspiratory center before overexpansion of lungs

A

pneumotaxic center

19
Q

this causes stretch receptors in the bronchii preventing over-stretching the lungs

A

herring - breuer relfex

20
Q

prevents turn off of inspiratory center

A

apneustic center

21
Q

boh reffect

A

co2 enters blood, causes o2 to dissociate from hemoglobin

22
Q

haldane effect

A

co2 combines with hemoglobin = more bicarbonate ions

23
Q

co2 in blood as

A

HCO3 (70%)

24
Q

co2 as carbaminohemoglobin

A

20%

25
Q

co2 dissolved in blood

A

7-8%

26
Q

what does affinity of hemoglobin for o2 do

A

shift curve to left

27
Q

increase co2 and h

A

shifts curve to right

28
Q

where does the ramp signal for inspiration come from

A

dorsal respiratory center

29
Q

TLC =

A

IRV + TV + ERV + RV

30
Q

VC =

A

IRV + TV + ERV

31
Q

X =

A

RV

32
Q

IC =

A

IRV + TV

33
Q

FRC =

A

ERV + RV

Boards pt1 (28 decks)

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