Respiratory Physiology Flashcards Preview

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Flashcards in Respiratory Physiology Deck (212)
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61

Collapsing tendency of the lungs reduces...

Lung volume during expiration

62

Title the figure

The mouse-elephant curve

63

Which air-flow types are observed in panting?

  • Parietal
  • Central

64

What kind of gas exchange occurs during panting?

Physiological gas exchange

  • Slight change in gas pressure

65

During panting, parietal gas exchange is...

Slow

66

Central gas stream

  • Fast
  • Heat exchange
  • Stimulates water release in mouth

67

Panting in species other than canines would cause...

  • Loss of CO2
  • Alkalosis

68

The spirometer measures...

Volume changes and air fractions of breathing

69

Ventilation

  • The quantity of air entering and leaving the lung
  • Per unit time

70

In the spirometer, the height of the upper cylinder indicates...

The size of the given volume fraction

71

Inspiratory Reserve Volume

(IRV)

72

Tidal volume

(TV or VT)

73

Expiratory Reserve Volume

(ERV)

74

Residual Volume

(RV)

75

Inspiratory Capacity

(IC)

76

Functional Residual Capacity

(FRC)

77

Vital Capacity

(VC)

78

Total Lung Capacity

(TLC)

79

VC =

VT + IRV + ERV

80

The deepness of inspiration increases...

 

  • The proportion of fresh air : used air
  • Measured with Ventilation coefficient

81

Ventilation coefficient

Vcoeff = fresh/used

82

Volume dead

  • Anatomical + physiological dead-space
  • Doesn't contribute to gas exchange

83

What contributes to anatomical dead space?

  • Air fraction of:
    • Upper respiratory tracts
    • Lower respiratory tracts

84

What contributes to the physiological dead space?

  • Occluded alveoli
  • Alveoli excluded from circulation

85

Used air =

FRC + VD

86

Fresh air = 

VT - VD

87

Pressure change in the pleural cavity

Intrapleural pressure

88

Pressure change in the lung

Intrapulmonar pressure

89

Intrapleural pressure is always...

Negative

90

Why is the intrapleural pressure always negative?

Gases constantly being absorbed by tissue