The conducting part of the human respiratory system transports atmospheric air to alveoli and also performs all the following functions except:
 
  • Clears the inhaled air of foreign particles
  • Humidifies the air
  • Brings the air to body temperature
  • Provides site for diffusion of gases into the blood
Under normal physiological conditions:
 
  • Inspiratory reserve volume is less than expiratory reserve volume
  • Residual volume in a healthy male is about 2500 to 3000 ml
  • Functional residual capacity should be more than expiratory capacity
  • Total lung capacity + residual volume = Vital capacity
In a healthy human, under normal physiological conditions the partial pressure of oxygen in systemic [oxygenated blood] circulation is:
 
  • about 104 mm Hg
  • about 40 mm Hg
  • about 95 mm Hg
  • about 159 mm Hg
Which of the following statements is not correct?
 
  • Every 100 ml of oxygenated blood can deliver around 5 ml of oxygen to the tissue under normal physiological conditions.
  • Oxygen gas has most potent effect on the central chemoreceptors and plays most vital role in regulation of respiration
  • Nearly 70 percent of carbon dioxide is carried as bicarbonate in the blood.
  • Every 100 ml of deoxygenated blood delivers about 4 ml of carbon dioxide to the alveoli.
Inspiration during breathing occurs when the pressure in lungs is:
  • Zero
  • Negative with respect to atmospheric pressure
  • Equal to atmospheric pressure
  • Positive with respect to atmospheric pressure
In the diffusion membrane in human lungs, a basement membrane supports:
I. Alveolar epithelium
II. Vascular endothelium
  • Only I
  • Only II
  • Both I and II
  • Neither I nor II
Under normal physiological conditions, what percent of haemoglobin is saturated with oxygen when the partial pressure of oxygen is 40 mm Hg?
  • 50
  • 75
  • 90
  • 98
Contraction of diaphragm and contraction of external intercostals:
  • decrease the intrapulmonary pressure and lead to inhalation
  • increase the intrapulmonary pressure and lead to inhalation
  • decrease the intrapulmonary pressure and lead to exhalation
  • increase the intrapulmonary pressure and lead to exhalation
Which of the following values for the given parameter is incorrect?
1. Partial pressure of oxygen in alveolar air 104 mm Hg
2. Partial pressure of carbon dioxide in deoxygenated blood 45 mm Hg
3. Transport of carbon dioxide in blood as bicarbonate 70 %
4. Transport of carbon dioxide as carbaminohemoglobin 7 %
  • 1
  • 2
  • 3
  • 4
For each unit difference in the partial pressure across the diffusion membrane, the amount of carbon dioxide that diffuses:
 
  • is higher than the amount of oxygen as the solubility of carbon dioxide is 20-25 times lower than that of oxygen
  • is lower than the amount of oxygen as the solubility of carbon dioxide is 20-25 times lower than that of oxygen
  • is higher than the amount of oxygen as the solubility of carbon dioxide is 20-25 times higher than that of oxygen
  • is lower than the amount of oxygen as the solubility of carbon dioxide is 20-25 times higher than that of oxygen
Which of the following pulmonary capacities is not correctly matched with its constituent pulmonary volumes?
1. Inspiratory capacity Tidal volume + Inspiratory reserve volume
2. Expiratory capacity Tidal volume + Expiratory reserve volume
3. Functional residual capacity Residual volume + Inspiratory reserve volume
4. Vital capacity Tidal volume + Inspiratory reserve volume + Expiratory reserve volume
  • 1
  • 2
  • 3
  • 4
In breathing:
 
  • Contraction of internal costal muscles leads to inhalation
  • Contraction of diaphragm increases the volume of thoracic chamber in dorso-ventral axis
  • Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure
  • The residual volume of the lungs averages 2500 ml to 3000 ml
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