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Which of the following is most sensitive regarding regulating breathing by the body?

A.

CO2 levels

B.

K+ levels

C.

02 levels

D.

Na+ levels

Answer and Explanation

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 ["A","B","D"]

Explanation

A. Pharynx: The pharynx (throat) is part of the upper respiratory tract and functions as a passageway for both air and food.

B. Nasal cavity: The nasal cavity is the main entryway for inhaled air and is part of the upper respiratory system.

C. Bronchial tree: The bronchial tree is part of the lower respiratory system, beginning with the bronchi and branching into bronchioles.

D. Larynx: The larynx (voice box) is part of the upper respiratory system; it connects the pharynx to the trachea.

E. Trachea: The trachea (windpipe) is part of the lower respiratory system.

Correct Answer is D

Explanation

A. Decreased K⁺ levels: Not related to respiratory drive.

B. Increased O₂ levels: May actually suppress the drive to breathe in COPD patients.

C. Decreased CO₂ levels: Would reduce respiratory drive, not increase it.

D. Increased CO₂ levels: Correct; high CO₂ levels stimulate the respiratory center to increase breathing rate.

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