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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Flushed: Not directly related to dyspnea.
B. Having difficulty breathing: Correct; dyspnea is defined as labored or difficult breathing.
C. Coughing up blood: This is hemoptysis, not dyspnea.
D. Not breathing: This is apnea, not dyspnea.
Correct Answer is A
Explanation
A. Diaphragm: The diaphragm is a dome-shaped muscle that contracts and flattens during inhalation, creating negative pressure to draw air into the lungs.
B. Pectoris minor: The pectoralis minor assists with deep or labored breathing but is not the primary muscle of inhalation.
C. Pectoris major: This chest muscle plays a role in arm movement and may assist minimally in labored breathing.
D. Intercostals: The intercostal muscles assist with breathing but are secondary to the diaphragm.
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