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

Gases diffuse over the respiratory surface because of.

  1. $pO _2$ is more in alveoli than in blood
  2. $pO _2$ is more in blood than in tissues
  3. $pCO _2$ is more in alveoli than in blood
  4. $pCO _2$ is more in blood than in tissues
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gas diffusion occurs from areas of higher partial pressure to areas of lower partial pressure. Oxygen diffuses from the alveoli (high pO2) into the blood (low pO2).

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

Arrange the following in order of increasing volume.
$1$. Tida. volume $2$. Residual volume $3$. Expiratory reserve volume $4$. Vital capacity.

  1. $1 < 2 < 3 < 4$
  2. $1 < 4 < 3 < 2$
  3. $1 < 3 < 2 < 4$
  4. $1 < 4 < 2 < 3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tidal volume (approx 500ml) < Expiratory reserve volume (approx 1000-1200ml) < Residual volume (approx 1200ml) < Vital capacity (approx 4600ml).

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.