Tag: respiration and associated structures

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Questions Related to respiration and associated structures

Multiple choice zoology gas exchange and smoking respiration in human beings respiration and associated structures respiration in humans

Fill the following table related to partial pressure (in mm of Hg) of respiratory gases in different parts: 

Respiratory gases  Alveoli Blood (oxygenated ) Tissues
$O _2$ - - $40$
$CO _2$ $40$ $40$ -
  1. $104,95,45$
  2. $40,45,95$
  3. $95,104,45$
  4. $95,40,45$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the alveoli, O2 is 104 and CO2 is 40. In oxygenated blood, O2 is 95 and CO2 is 40. In tissues, O2 is 40 and CO2 is 45.

Multiple choice zoology gas exchange and smoking respiration in human beings respiration and associated structures respiration in humans respiratory organs in humans

Oxygen and carbon dioxide concentration in the alveolar air is respectively.

  1. $16\%$ and $4\%$
  2. $19.8\%$ and $4.6\%$
  3. $21\%$ and $4\%$
  4. $13.1\%$ and $5.3\%$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Alveolar air contains approximately 13.1% oxygen and 5.3% carbon dioxide, reflecting the exchange that has occurred with the blood.

Multiple choice zoology gas exchange and smoking respiration in human beings respiration and associated structures respiration in humans respiratory organs in humans

Approximate normal composition of alveolar air is?

  1. $14\% O _2, 6\% CO _2, 80\% N _2$
  2. $16\% O _2, 3\% CO _2, 81\% N _2$
  3. $21\% O _2, 2\% CO _2, 77\% N _2$
  4. $10\% O _2, 8\% CO _2, 82\% N _2$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Alveolar air composition is approximately 14% oxygen, 6% carbon dioxide, and 80% nitrogen. This differs from atmospheric air due to the continuous exchange of gases in the lungs.

Multiple choice zoology gas exchange and smoking respiration in human beings respiration and associated structures respiration in humans respiratory organs in humans

What is correct?

  1. Pulmonary ventilation is equal to alveolar ventilation

  2. Alveolar ventilation is less than pulmonary ventilation

  3. Alveolar ventilation is more than pulmonary ventilation

  4. The two are variable
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pulmonary ventilation is the total volume of air moved into and out of the lungs per minute. Alveolar ventilation is lower because it excludes the air that remains in the anatomical dead space where no gas exchange occurs.

Multiple choice zoology gas exchange and smoking respiration in human beings respiration and associated structures respiration in humans respiratory organs in humans

Complete and balance the following equation $Na _2HPO _4+X\rightarrow Y+NaH _2PO _4$.

  1. $X=NaHCO _3, Y=NaCl$
  2. $X=NaHCO _3, Y=H _2CO _3$
  3. $X=H _2CO _3, Y=NaH _2CO _3$
  4. $X=H _2CO _3, Y=NaHCO _3$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The reaction Na2HPO4 + H2CO3 -> NaHCO3 + NaH2PO4 is a standard buffer reaction where carbonic acid reacts with disodium hydrogen phosphate to form sodium bicarbonate and sodium dihydrogen phosphate.

Multiple choice zoology gas exchange and smoking respiration in human beings respiration and associated structures respiration in humans respiratory organs in humans

The partial pressure of oxygen in the alveoli of lungs is?

  1. Less than that of $CO _2$

  2. Equal to that in blood

  3. More than that in the blood

  4. Less than that in the blood
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Oxygen diffuses from the alveoli into the blood because the partial pressure of oxygen in the alveoli (approx. 104 mmHg) is higher than that in the deoxygenated pulmonary capillary blood (approx. 40 mmHg).