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"Inspired air " is the stuff around us, so

O2 is about 20% & CO2 is about .003 % ...

and why? is because of plants and chlorophyll.

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12y ago

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Is Pco2 is greater in the alveoli than it is in the arterial end of pulmonary capillaries?

No. Once blood reaches the alveoli it will immediately start to release CO2 to the air in our lungs and absorb O2 from the air in our lungs. This means that the PCO2 will be higher in the blood of the pulmonary artery than in the blood of the alveolus. If this were not so, then passing blood through the alveoli would be pointless.


How does expired air differ from inspired air?

Both Inspired and expired air have higher amounts of oxygen than Carbon Dioxide. Inspired air has higher amounts of oxygen than expired, while expired air has higher amounts of Carbon Dioxide than inspired air.


Why is there a higher pco2 with rebreathing?

Rebreathing can lead to a higher PCO2 because it involves inhaling the already exhaled air, which contains higher levels of carbon dioxide. This reduces the exchange of fresh oxygen from the environment, causing an accumulation of carbon dioxide in the respiratory system and increased PCO2 levels.


What is pco2 in atmosphere?

The pCO2 is the partial pressure of carbon dioxide in blood moving through the arteries of the human body. While it can be impacted by a high carbon dioxide concentration in the air being breathered, it is not a thing that is measured in connection with the atmosphere.Normal values o pCO2 in arterial blood are considered to be 35 - 45 mmHg.


Where is PCO2 the lowest?

PCO2, or partial pressure of carbon dioxide, is typically lowest in the atmosphere, particularly in areas with high vegetation or during times of photosynthesis, such as daylight hours when plants absorb CO2. Additionally, PCO2 is lower in the upper layers of the ocean compared to deeper waters, where respiration and decomposition release CO2. In general, regions with high air circulation and low human activity also tend to have lower PCO2 levels.


Water content of expired air is less than inspired air?

Yes, the expired air has a lower water content compared to inspired air due to moisture being extracted from the air during gas exchange in the lungs. This process helps to humidify the inspired air and prevent the respiratory system from becoming too dry.


What percentage of oxygen is in inspired air?

About 21% of inspired air is oxygen.


Why does expired air contain more carbon dioxide than inspired air?

I did not quite get this, but if this helps, good. ( this is from my biology book)"Carbon dioxide is made by cells as a waste product of respiration, and is released across the gaseous exchange surface"


What is cold air more than warm air?

Cold air is more dense than warm air.


What gas is more abundant in exhaled air than inhaled air?

Nitrogen is the most abundant gas in the atmosphere ( ~ 80% ) and therefore is the dominant species in both inspired as well as expired air.


Is lead more dense than air?

Lead is more dense than air.


Why does water exert more pressure than air?

Water is more dense than air is.