Which of the following is most sensitive regarding regulating breathing by the body?
CO2 levels
K+ levels
02 levels
Na+ levels
The Correct Answer is A
A. CO₂ levels: Correct; central chemoreceptors are most sensitive to carbon dioxide levels.
B. K⁺ levels: Affects cardiac function more than breathing.
C. O₂ levels: Peripheral chemoreceptors respond to oxygen, but CO₂ is the primary stimulus.
D. Na⁺ levels: Affects fluid balance, not breathing regulation directly.
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Related Questions
Correct Answer is B
Explanation
A. Cerebellum: The cerebellum coordinates movement and balance, not respiration.
B. Medulla oblongata: The medulla controls the rate and depth of breathing by monitoring CO₂ and pH levels.
C. Hypothalamus: The hypothalamus regulates homeostasis and emotions, not directly breathing.
D. Cerebrum: The cerebrum controls voluntary actions and higher-level thinking, not automatic respiration.
Correct Answer is C
Explanation
A. Lungs: lungs house alveoli but are not the site of gas exchange themselves.
B. Bronchi: they conduct air but don’t exchange gases.
C. Alveoli: this is the primary site where oxygen and carbon dioxide are exchanged.
D. Trachea: it’s a passageway for air, not a site for gas exchange.
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