Multiple Choice
Which of the following correctly describes the path of air as it travels from the external environment to the alveoli in human lungs?
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40. Circulatory System
Gas Exchange
Multiple Choice
Which of the following would increase the release of oxygen from red blood cells?
A
A decrease in pH and an increase in the PO2
B
An increase in pH and an increase in the PO2
C
An increase in pH and a decrease in the PO2
D
None of the listed responses is correct.
E
A decrease in pH and a decrease in the PO2
Verified step by step guidance1
Understand the Bohr effect: The Bohr effect describes how changes in pH and carbon dioxide concentration affect the affinity of hemoglobin for oxygen. A decrease in pH (more acidic environment) reduces hemoglobin's affinity for oxygen, promoting oxygen release.
Consider the role of partial pressure of oxygen (PO2): A decrease in PO2 means there is less oxygen available in the surrounding environment, which encourages hemoglobin to release more oxygen to tissues.
Analyze the options: The correct scenario for increased oxygen release involves both a decrease in pH and a decrease in PO2, as these conditions together enhance the release of oxygen from hemoglobin.
Evaluate the given options: Compare each option to the conditions that promote oxygen release. Only the option with both a decrease in pH and a decrease in PO2 matches the conditions described by the Bohr effect.
Conclude with the correct choice: Based on the analysis, the correct answer is the option that states a decrease in pH and a decrease in PO2, as these conditions align with the physiological mechanisms that increase oxygen release from red blood cells.
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