Which of the following correctly describes the events at the alveoli?Blood leaves the alveoli with a partial pressure of 45mmHg carbon dioxideBlood enters the alveoli with a partial pressure of 40mmHg carbon dioxideBlood leaves the alveoli with a partial pressure of 100mmHg oxygenBlood enters the alveoli with a partial pressure of 30mmHg oxygen
Question
Which of the following correctly describes the events at the alveoli?Blood leaves the alveoli with a partial pressure of 45mmHg carbon dioxideBlood enters the alveoli with a partial pressure of 40mmHg carbon dioxideBlood leaves the alveoli with a partial pressure of 100mmHg oxygenBlood enters the alveoli with a partial pressure of 30mmHg oxygen
Solution
The correct description of the events at the alveoli is as follows:
Blood enters the alveoli with a partial pressure of 40mmHg carbon dioxide and a partial pressure of 100mmHg oxygen. This is because the blood is coming from the pulmonary arteries, which carry deoxygenated blood high in carbon dioxide from the heart to the lungs.
In the alveoli, gas exchange occurs. Oxygen from the air in the alveoli diffuses into the blood, and carbon dioxide from the blood diffuses into the alveoli. This is due to the differences in partial pressures - gases move from areas of high pressure to areas of low pressure.
As a result, blood leaves the alveoli with a partial pressure of 45mmHg carbon dioxide and a partial pressure of 100mmHg oxygen. This oxygen-rich blood is then carried back to the heart via the pulmonary veins, ready to be pumped to the rest of the body.
Similar Questions
If the partial pressure of oxygen is greater in the alveoli than in the blood, which of the following will occur?
In the alveoli with low ventilation to perfusion ratio:Question 8Select one:a.The blood leaving the alveoli has lower CO2 than the blood entering the alveoli.b.The blood leaving the alveoli has the same CO2 as the blood entering the alveoli.c.The blood leaving the alveoli has higher O2 than the blood entering the alveoli.d.The blood leaving the alveoli has higher CO2 than the blood entering the alveoli.
For gas exchange to take place, the alveoli must have a ____i____ concentration of oxygen whilst the surrounding capillaries have a ____ii____ concentration of oxygen.
The concentration of carbon dioxide is higher in the alveoli than in the blood
What diffuses from the air in the alveoli into the blood?Multiple Choiceoxygencarbon dioxidewaternitrogenAll of the answer choices diffuse from air into blood.
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