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 A
Explanation
A. Hypoxemia specifically refers to low levels of oxygen in the arterial blood, which can lead to tissue hypoxia if not corrected. It is often detected through arterial blood gas (ABG) analysis or pulse oximetry.
B. Excess oxygen in the blood is rare and may occur with supplemental oxygen therapy, but it is not the definition of hypoxemia.
C. Excess oxygen in the tissues is not a standard clinical term and does not relate to the condition known as hypoxemia.
D. Excess carbon dioxide in the blood is called hypercapnia, not hypoxemia.
Correct Answer is B
Explanation
A. Capillaries are small blood vessels that are involved in the exchange of gases but are not part of the bronchial tree.
B. The bronchiole is the smallest division of the bronchial tree. It is a narrow airway that connects the larger bronchi to the alveoli, where gas exchange occurs.
C. Arterioles are small blood vessels that are part of the circulatory system, not the respiratory system.
D. The alveoli are the small air sacs at the end of the bronchioles where gas exchange occurs, but they are not the smallest subdivision of the bronchial tree—this is the bronchiole itself.
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