Which gas is the primary regulator of respiration?.
Nitrogen.
Carbon dioxide.
Oxygen.
Bicarbonate.
The Correct Answer is B
The correct answer is Choice B.
Choice A rationale:
Nitrogen is the most abundant gas in the atmosphere, but it is not the primary regulator of respiration.
Choice B rationale:
Carbon dioxide (CO2) is the main chemical regulator of respiration and the potent stimulus of the respiratory centers via the arterial chemoreceptors and directly on the central chemoreceptors.
Choice C rationale:
Oxygen is essential for cellular respiration, but it is not the primary regulator of respiration.
Choice D rationale:
Bicarbonate plays a role in maintaining the pH balance in the blood and is not the primary regulator of respiration.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale:
While an LH surge does trigger ovulation, it is not the anatomical event of ovulation.
Choice B rationale:
Ovulation is the event when the Graafian follicle ruptures and releases an ovum.
Choice C rationale:
Blood menstrual flow is part of menstruation, which occurs after ovulation if the ovum is not fertilized.
Choice D rationale:
Crampy abdominal pelvic pain can occur with ovulation, but it is not the anatomical event of ovulation.
Correct Answer is C
Explanation
The correct answer is Choice C. -
Choice A rationale:
The larynx is part of the airway but does not prevent aspiration. -
Choice B rationale:
The trachea is the airway leading to the lungs but does not prevent aspiration. -
Choice C rationale:
The epiglottis is a flap of tissue that covers the airway during swallowing, preventing food from entering the lungs. -
Choice D rationale:
The pharynx is part of the throat but does not prevent aspiration.
So, the correct answer is C, after analyzing all choices.
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