Open Question
Clearly explain the difference between external and internal respiration.
22. The Respiratory System
Respiration
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Which gradient most directly determines the direction that oxygen and carbon dioxide molecules will move between the air in the alveoli and the blood:
A
The pressure gradient between alveolar air and the blood plasma.
B
The concentration gradient between the hemoglobin and the blood plasma.
C
The concentration gradient between carbon dioxide and oxygen.
D
The pressure gradient between the hemoglobin and alveolar air.
Verified step by step guidance1
Understand the concept of gas exchange in the alveoli: Oxygen and carbon dioxide move between the alveoli and the blood based on gradients.
Identify the types of gradients involved in gas exchange: Pressure gradients and concentration gradients are key factors.
Recognize that the pressure gradient between alveolar air and blood plasma is crucial: This gradient directly influences the movement of gases.
Consider the role of hemoglobin: While hemoglobin binds oxygen, the gradient between hemoglobin and blood plasma is not the primary determinant for gas movement.
Conclude that the pressure gradient between alveolar air and blood plasma most directly determines the direction of gas movement: This gradient drives oxygen into the blood and carbon dioxide out of the blood.
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