Where are the respiratory control areas located?
Hypothalamus
Pons and medulla oblongata
Alveoli
Cerebral cortex
The Correct Answer is B
A. Hypothalamus -The hypothalamus regulates autonomic functions like temperature, but not primary breathing rhythms.
B. Pons and medulla oblongata -The medulla sets the basic rhythm of breathing, and the pons fine-tunes it.
C. Alveoli -Alveoli are sites of gas exchange, not neural control.
D. Cerebral cortex -The cortex allows voluntary control of breathing but is not the main respiratory control center.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is {"dropdown-group-1":"A"}
Explanation
The esophagus passes through the diaphragm and empties into the stomach (cardia region), so the stomach lies immediately inferior to the distal esophagus.
Correct Answer is C
Explanation
A. It causes extreme depression of the respiratory rate: CO binds hemoglobin and impairs O₂ delivery; respiratory depression is not the primary danger
B. It drastically decreases the pH of the blood: CO poisoning does not primarily cause a dramatic blood pH drop
C. It binds to the oxygen-binding site on hemoglobin, so the O₂-carrying ability of the blood is reduced: CO binds avidly to hemoglobin’s heme sites, displacing O₂ and reducing oxygen carriage and delivery
D. It triggers hyperventilation, causing a severe drop in PCO₂ and increase in blood pH: Hyperventilation is not the main mechanism of CO toxicity
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