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 C
Explanation
Choice A rationale:
Sinusoids are a type of capillary found in some organs, not vessels that carry blood to the heart from the lungs.
Choice B rationale:
Arteries typically carry oxygenated blood away from the heart to the body’s tissues, not to the heart from the lungs.
Choice C rationale:
Veins, specifically the pulmonary veins, carry oxygenated blood from the lungs to the heart.
Choice D rationale:
Arterioles are small branches of arteries that lead to capillaries, not vessels that carry blood to the heart from the lungs.
Correct Answer is B
Explanation
Choice A rationale:
The arachnoid is not the innermost layer, it is in the middle. -
Choice B rationale:
The correct order of the meninges from inside to outside is Pia mater, arachnoid, and dura mater. -
Choice C rationale:
The dura mater is not the innermost layer, it is the outermost layer. -
Choice D rationale:
Gray matter is not a layer of the meninges.
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