Table of Contents
- 1 Why is there more oxygen in expired air than alveolar air?
- 2 Why CO2 concentration is more in alveolar air than in expired air?
- 3 Is expired air carbon dioxide?
- 4 How does the transport of o2 and co2 by blood take place?
- 5 Does exhaled air contains more oxygen than carbon dioxide?
- 6 Does expired air contain oxygen?
- 7 Why is CO2 more soluble than o2 in blood?
- 8 How does CO2 affect hemoglobin oxygen binding?
- 9 What happens when you mix expired air and water vapour?
- 10 What is the pressure of CO2 in the alveoli?
Why is there more oxygen in expired air than alveolar air?
This is because the volume of the expired air is slightly less than that of inspired air, which is caused by the fact that the amount of CO2 evolved is less than the amount of oxygen absorbed.
Why CO2 concentration is more in alveolar air than in expired air?
Since carbon dioxide is expired, the partial pressure of carbon dioxide within the lungs should be greater than that of the expired air. Therefore during expiration, the carbon dioxide concentration in the alveolar air is greater than that in the expired air.
Which produces more co2 expired air or atmospheric air?
Gas exchange takes place by diffusion in the alveoli within the lungs. As a result the composition of inhaled and exhaled air is different….Inhaled and exhaled air.
Gas | \% in inhaled air | \% in exhaled air |
---|---|---|
Oxygen | 21 | 16 |
Carbon dioxide | 0.04 | 4 |
Nitrogen | 79 | 79 |
NB These figures are approximate. |
Is expired air carbon dioxide?
Inhaled and exhaled air Compared to atmospheric air, exhaled air contains: less oxygen. more carbon dioxide.
How does the transport of o2 and co2 by blood take place?
The transport of O2 and CO2 occurs with the help of RBCs and blood plasma. 97\% of O2 is transported by R4BCs and 3\% of O2 is carried by plasma. About 7\% of CO2 is transported in plasma and rest by RBCs (23\%) by binding with Hb and 70\% reacts with water to form carbonic acid in RBCs.
Why does exhaled air contain less o2 than inhaled air?
Because the air inhaled is used up by our body cells for respiration.. Therefore exhaled air contains less oxygen than inhaled air because it has more of carbon dioxide which is one of the by products of respiration…
Does exhaled air contains more oxygen than carbon dioxide?
Inhaled and exhaled air
Gas | \% in inhaled air | \% in exhaled air |
---|---|---|
Oxygen | 21 | 16 |
Carbon dioxide | 0.04 | 4 |
Nitrogen | 79 | 79 |
NB These figures are approximate. |
Does expired air contain oxygen?
Exhaled air contains less oxygen and more carbon dioxide, it is also saturated with water vapour. Exhaled air contains: 78\% nitrogen. 16\% oxygen.
How does expired air differ from atmospheric air?
Compared to atmospheric air, exhaled air contains: less oxygen. more carbon dioxide.
Why is CO2 more soluble than o2 in blood?
CO2 when dissolves in water, interacts with surrounding h2o molecules to hydrate itself, i.e. the electro negative atoms of CO2 forms strong H-bond with H atoms of water molecules. This interaction is very strong to dissolve more & more CO2 molecules.
How does CO2 affect hemoglobin oxygen binding?
Since carbon dioxide reacts with water to form carbonic acid, an increase in CO2 results in a decrease in blood pH, resulting in hemoglobin proteins releasing their load of oxygen. Conversely, a decrease in carbon dioxide provokes an increase in pH, which results in hemoglobin picking up more oxygen.
Why does expired air have a higher O2 concentration than alveolar air?
As such I might think that expired air should have a higher O2 concentration than alveolar air due to the turbulent mixing of air that has undergone exchange with air that has been sitting in the trachea and bronchi (and other voids that perform little to no gas exchange).
What happens when you mix expired air and water vapour?
It is warmed and humidified (and that partial pressure of water vapour dilutes down the oxygen a bit). And of course, mixed expired air is somewhere in composition between alveolar gas and room air, so its oxygen level is higher than alveolar gas and its CO2 lower.
What is the pressure of CO2 in the alveoli?
CO2 has a partial pressure of 0.3 mmHg in air and 40mmHg in alveoli. The air that we inspire is a mixture of gases. The most important of these are nitrogen, oxygen, carbon dioxide and water vapour. When the warm, wet air from our lungs meets the cold air of the atmosphere the water vapour condenses into mist.
What is the difference between alveolar air and inspired air?
Only a part of the alveolar air is replaced by inspired air . ii. There is continuous absorption of O 2 from the alveolar air by pulmonary venous blood – the alveolar air, therefore, is poorer in oxygen.