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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","C","D"]

Explanation

A. Trachea: The trachea is the beginning of the lower respiratory tract and conducts air to the bronchi.

B. Pharynx: The pharynx is part of the upper respiratory system.

C. Lungs: The lungs are the primary organs of the lower respiratory tract responsible for gas exchange.

D. Bronchial tree: The bronchial tree, including bronchi and bronchioles, is part of the lower respiratory system.

E. Larynx: The larynx is the uppermost structure of the lower respiratory system in some classifications but is more commonly considered part of the upper respiratory tract.

Correct Answer is C

Explanation

A. Pharynx: Transports air but is not primarily responsible for warming/moistening.

B. Larynx: Functions in voice production and airway protection.

C. Nostrils/nares: Correct; nasal passages warm, moisten, and filter the air.

D. Alveoli: Site of gas exchange, not air conditioning.

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