What physiological changes do the brainstem respiratory centers respond to when adjusting respiratory rate?
Hormone levels and glucose concentration
Temperature and blood pressure
Pulse rate and hydration status
Carbon dioxide, oxygen, and pH levels in the blood
The Correct Answer is D
A. Hormone levels and glucose concentration: Hormones and blood glucose influence metabolism and energy availability but do not directly regulate respiratory rate. The brainstem respiratory centers respond primarily to chemical signals in the blood rather than endocrine or metabolic changes.
B. Temperature and blood pressure: While body temperature and blood pressure can have minor effects on respiratory rate, they are not the primary drivers of ventilation. The central and peripheral chemoreceptors monitor blood gases and pH to adjust breathing more precisely than these indirect physiological factors.
C. Pulse rate and hydration status: Pulse rate and hydration status reflect cardiovascular function and fluid balance but do not directly influence the neural control of respiration. Respiratory adjustments are driven by chemical feedback rather than cardiovascular parameters alone.
D. Carbon dioxide, oxygen, and pH levels in the blood: The brainstem respiratory centers, including the medulla oblongata and pons, detect changes in PaCO₂, PaO₂, and blood pH via central and peripheral chemoreceptors. Increased CO₂ or H⁺ levels stimulate the centers to increase ventilation, while low oxygen can also trigger respiratory adjustments, ensuring proper gas exchange and acid-base balance.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Pollen, Mold, Dust: These are common environmental allergens that can trigger an asthma attack by provoking an IgE-mediated hypersensitivity reaction. Mast cells release histamine and other mediators, causing bronchoconstriction, airway edema, and increased mucus production.
B. Anxiety: Emotional stress and anxiety can precipitate asthma symptoms by stimulating the autonomic nervous system, leading to bronchospasm and hyperventilation. While not an allergen, anxiety is recognized as a non-specific trigger of asthma exacerbations.
C. Caffeine or Tea: Caffeine and tea contain mild bronchodilatory methylxanthines. Rather than triggering asthma, they may slightly relax bronchial smooth muscle and have protective effects against airway constriction. They are not considered asthma triggers.
D. Exercise: Physical activity, especially in cold or dry air, can provoke exercise-induced bronchoconstriction in susceptible individuals. This is a well-established trigger due to increased ventilation and airway cooling, leading to airway hyperreactivity.
Correct Answer is {"dropdown-group-1":"C"}
Explanation
A. Bone: Bone provides rigid structural support in the skeletal system but is not present in the respiratory tract. Alveolar ducts are soft, flexible structures and do not contain bone tissue, making this choice anatomically incorrect.
B. Fibrous tissue: Fibrous connective tissue contributes to the structural framework and elasticity of the lungs, but alveolar ducts specifically rely on smooth muscle to regulate airway diameter. Fibrous tissue alone does not allow the dynamic changes needed during respiration.
C. Smooth muscle: Alveolar ducts are composed of smooth muscle and connective tissue, which allows them to adjust diameter during ventilation. This smooth muscle facilitates airflow regulation to the alveolar sacs, aids in maintaining airway patency, and contributes to the fine control of gas distribution in clusters of alveoli.
D. Cartilage: Cartilage provides rigidity in larger airways such as the trachea and bronchi, but it is absent in the alveolar ducts. The flexibility of alveolar ducts is necessary for effective alveolar expansion and gas exchange, which cartilage would restrict.
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