The active phase of normal, relaxed breathing is:
Exhalation
Apnea
Inhalation
Expiration
The Correct Answer is C
A. Exhalation is the passive phase of normal breathing and occurs without effort during relaxed respiration. It involves the diaphragm and intercostal muscles relaxing, allowing air to flow out of the lungs.
B. Apnea refers to a temporary cessation of breathing and is not a phase of normal breathing.
C. Inhalation is the active phase of normal, relaxed breathing. It requires energy as the diaphragm contracts and moves downward and the intercostal muscles contract to expand the chest cavity, allowing air to enter the lungs.
D. Expiration is another term for exhalation, which is passive during normal relaxed breathing.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. The cerebral cortex is involved in higher brain functions like thinking and voluntary control of breathing but does not contain central chemoreceptors.
B. Central chemoreceptors are located in the medulla oblongata, a part of the brain stem. They detect changes in the pH of cerebrospinal fluid, which reflects CO₂ levels in the blood, and help regulate breathing accordingly.
C. The aorta contains peripheral chemoreceptors, not central ones. These aortic bodies monitor blood oxygen, carbon dioxide, and pH, but they are outside the central nervous system.
D. The cerebellum coordinates motor control and balance and does not play a role in chemoreception.
Correct Answer is D
Explanation
A. Inspiration is the phase when air is drawn into the lungs and alveoli.
B. Inhalation is synonymous with inspiration, referring to the process of taking air into the lungs.
C. Compliance refers to the ability of the lungs to stretch and expand, not a phase of ventilation.
D. Exhalation (or expiration) is the phase where air is expelled from the alveoli, moving out of the lungs and through the respiratory tract.
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