Tag: gas exchange in humans

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Questions Related to gas exchange in humans

Multiple choice zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

According to Boyle's law, the product of pressure and volume is constant, hence.

  1. If volume of lung is increased, the pressure decreases proportionately

  2. If volume of lung is increased, the pressure also increases proportionately

  3. If volume of lungs is increased, the pressure decreases disproportionately

  4. If volume of lungs is increased, the pressure remains the same
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Boyle's Law states that pressure is inversely proportional to volume (P = k/V). Thus, increasing the volume of the thoracic cavity decreases the pressure inside the lungs.

Multiple choice zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

Surfactant is?

  1. Protein produced by type II alveolar cells

  2. Excessive in many premature infants causing difficulty in breathing

  3. Decreases surface tension of fluid lining alveoli

  4. Lacking in individuals suffering from acute respiratory distress syndromes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pulmonary surfactant is a mixture of lipids and proteins that reduces the surface tension of the fluid lining the alveoli, preventing them from collapsing during expiration.

Multiple choice zoology gas exchange and smoking gas exchange gas exchange in humans respiratory system in humans

Partial pressures of oxygen and carbon dioxide in healthy human lung alveoli are respectively about.

  1. $104$ and $40$mm Hg
  2. $90$ and $20$mm Hg
  3. $40$ and $45$mm Hg
  4. $159$ and $0.3$mm Hg
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In healthy human alveoli, the partial pressure of oxygen (pO2) is approximately 104 mm Hg and the partial pressure of carbon dioxide (pCO2) is approximately 40 mm Hg.