Tag: respiration and associated structures

Questions Related to respiration and associated structures

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. $95,40,45$


Correct Option: A

The exchange of respiratory gases with the blood occurs at.

  1. Secondary bronchi

  2. Alveolar duct

  3. Alveolar wall

  4. Nasal chambers


Correct Option: C

In lungs, a respiratory bronchiole divides to form.

  1. Alveolar ducts

  2. Alveolar sacs

  3. Alveoli

  4. Terminal bronchioles


Correct Option: A

Which is the end part of pulmonary or lung division and place of gaseous exchange?

  1. Bronchiole

  2. Alveolus

  3. Air chamber

  4. Trachiole


Correct Option: B

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 $5.3\%$


Correct Option: D

Inner/alveolar surface area of human lungs is?

  1. $1m^2$

  2. $10m^2$

  3. $100m^2$

  4. $1000m^2$


Correct Option: C

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. $10\% O _2, 8\% CO _2, 82\% N _2$


Correct Option: A

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


Correct Option: B

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. $X=H _2CO _3, Y=NaHCO _3$


Correct Option: D

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


Correct Option: C