Exchange of Gases

Q.

Which of the following statements is incorrect about the transport of gases?

1. About 98% of O₂ is transported by RBCs in the blood.

2. About 3% of O₂ is carried in dissolved state in the plasma.

3. About 70% of CO₂ is carried in dissolved state in the plasma.

4. About 20-25% of CO₂ is transported by RBCs.

Q. When carbon dioxide concentration in blood increases, breathing becomes ____________.

1. There is no effect on breathing
2. Slow and deep
3. Faster and deeper
4. Shallower and slow

Q. Which of the following statement(s) regarding respiration in humans is/are not correct?

1. Exchange of gases takes place in alveoli region
2. Oxygen is transported only by RBC
3. Exchange of gases takes place by the process of diffusion
4. All are incorrect

Q. The factor, which does not affect the rate of alveolar diffusion is

1. Solubility of gases
2. Thickness of the membranes
3. Pressure gradient
4. Concentration gradient
5. Reactivity of the gases

Q. The atmospheric pressure of oxygen ______ with an increase in altitude.

1. decreases
2. increases
3. remains constant
4. slightly changes

Q. What is the site for respiratory gas exchange in the human body?

1. Alveoli
2. RBC
3. Lungs
4. None of the above

Q.

Which of following statements is not true?

1. The partial pressure of oxygen in deoxygenated blood is 40 mm Hg

2. The partial pressure of oxygen in oxygenated blood is 95 mm Hg

3. The partial pressure of oxygen in the alveolar air is 104 mm Hg

4. The partial pressure of carbon dioxide in the alveolar air is 40 mm Hg

5. The partial pressure of carbon dioxide in deoxygenated blood is 95 mm Hg

Q. What happens when partial pressure of oxygen becomes same in the alveoli and alveolar capillary?

Q.

WHY RESPIRATION IS NOT A PART OF BREATHING?

Q.

What is the partial pressure of oxygen and carbon dioxide in atmospheric air?

1. 160 mmHg and 0.23 mmHg

2. 104 mmHg and 40 mmHg

3. 40 mmHg and 45 mmHg

4. 95 mmHg and 40 mmHg

Q. the alveolar PCO2 exceed or be less than 46mmhg to result in diffusion of CO2 from the blood to alveoli.

Q.

The exchange of gases between the alveoli and blood in the lungs, as well as between blood and tissue, depends on

1. Pressure of the gases

2. Partial pressure of the gases

3. Pressures and the diffusion capacity of the gases

4. Diffusion capacity of the gases

Q.

Which of the choices below is not a functional process performed by the respiratory system?

1. Pulmonary ventilation

2. Transport of respiratory gases

3. External respiration

4. Pulmonary respiration

Q.

Gas is exchanged in the alveoli by a process of _____.

1. Simple diffusion

2. Active transport

3. Facilitated diffusion

4. Filtration

Q.

The correct pathway of movement of gases in the body is

1. Oxygen from alveoli – pulmonary vein – left atrium – left ventricle – systemic arteries – tissues – carbon dioxide from tissues – systemic veins – right atrium – right ventricle – pulmonary artery – alveoli.

2. Oxygen from alveoli – pulmonary artery – left atrium – left ventricle – systemic arteries – tissues – carbon dioxide from tissues – systemic veins – right atrium – right ventricle – pulmonary vein – alveoli.

3. Oxygen from alveoli – pulmonary vein – left atrium – left ventricle – systemic veins – tissues – carbon dioxide from tissues – systemic arteries – right atrium – right ventricle – pulmonary artery – alveoli.

4. Oxygen from alveoli – pulmonary vein – right atrium – right ventricle – systemic arteries – tissues – carbon dioxide from tissues – systemic veins – left atrium – left ventricle – pulmonary artery – alveoli