Exchange of Gases
Trending Questions
What is the partial pressure of oxygen and carbon dioxide in atmospheric air?
160 mmHg and 0.23 mmHg
104 mmHg and 40 mmHg
40 mmHg and 45 mmHg
95 mmHg and 40 mmHg
- Alveolar wall
- Capillary endothelium
- Pleural membrane
- Basement membrane
- Po2 40 mm Hg; Pco2 45 mm Hg
- Po2 95 mm Hg; Pco2 40 mm Hg
- Po2 40 mm Hg; Pco2 40 mm Hg
- Po2 45 mm Hg; Pco2 40 mm Hg
- Po2 104 mm Hg; Pco2 159 mm Hg
Which of the following statements is wrong?
The partial pressure of CO2 is higher in the air inside the lungs than inside the venous blood
The partial pressure of O2 is higher in the air inside the lungs than in the arterial blood.
The partial pressure of O2 is lower inside the venous blood than in the air in the lungs.
The partial pressure of CO2 is higher inside the venous blood than in the air inside the lungs.
What is the normal pCO2 of the capillary blood?
0.05 mm Hg
45 mm Hg
40 mm Hg
104 mmHg
- Solubility of gases
- Thickness of the membranes
- Pressure gradient
- Concentration gradient
- Reactivity of the gases
- decreases
- increases
- remains constant
- slightly changes
If the partial pressures of oxygen and carbon dioxide in the alveoli are 104 and 40 and in the blood reaching the alveoli at that moment it is 40 and 45 respectively, then oxygen and carbon dioxide will diffuse from
Both oxygen and carbon dioxide will diffuse from blood into alveoli
Oxygen will diffuse from blood into alveoli and carbon dioxide will diffuse from alveoli into blood
Oxygen will diffuse from alveoli into blood and carbon dioxide will diffuse from blood into alveoli
There will be no exchange of gases
- 21%
- 16%
- 79%
- 4%
- Alveolar pO2 is 159 mm Hg
- pCO2 in deoxygenated blood is 45 mm Hg
- pCO2 in oxygenated blood is 40 mm Hg
- pO2 in deoxygenated blood is 40 mm Hg
People living at sea level have around 5 million RBCs per cubic millimetre of their blood whereas those living at an altitude of 5, 400 m have around 8 million. This is because at high altitude,
People eat more nutritious food, therefore more RBCs are formed
People get pollution-free air to breathe and more oxygen is available
There is more UV radiation from the sun which enhances RBC production
Atmospheric oxygen is less and hence more RBCs are needed to absorb the required amount of oxygen to survive
- Red blood cells
- White blood cells
- Liver cells
- Unstriated muscle cells
- Exchange of gases takes place in alveoli region
- Oxygen is transported only by RBC
- Exchange of gases takes place by the process of diffusion
- All are incorrect
Which of following statements is not true?
The partial pressure of oxygen in deoxygenated blood is 40 mm Hg
The partial pressure of oxygen in oxygenated blood is 95 mm Hg
The partial pressure of oxygen in the alveolar air is 104 mm Hg
The partial pressure of carbon dioxide in the alveolar air is 40 mm Hg
The partial pressure of carbon dioxide in deoxygenated blood is 95 mm Hg
The exchange of gases between the alveoli and blood in the lungs, as well as between blood and tissue, depends on
Pressure of the gases
Partial pressure of the gases
Pressures and the diffusion capacity of the gases
Diffusion capacity of the gases