An individual with A antigens on their RBCs but no B antigens has which ABO blood type?
Type AB
Tуре O
Either Type A or Type B, there is not enough information to distinguish between them
Type B
Type A
The Correct Answer is E
A. Type AB: Type AB has both A and B antigens.
B. Type O: Type O has neither A nor B antigens.
C. Either Type A or Type B, there is not enough information to distinguish between them: Presence of A antigens and absence of B antigens identifies Type A (unless testing error or weak expression, but standardly it’s Type A).
D. Type B: Type B would have B antigens (and no A).
E. Type A: A antigens present and B antigens absent - Type A.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
A. Prolactin (PRL): Prolactin is produced and secreted by the anterior pituitary (lactotrophs), not the posterior pituitary.
B. Thyroid hormone (TH): Thyroid hormones (T3/T4) are produced by the thyroid gland, not by the pituitary.
C. Adrenocorticotropic hormone (ACTH): ACTH is produced by the anterior pituitary (corticotrophs), not the posterior.
D. Growth hormone (GH): GH is secreted by the anterior pituitary (somatotrophs), not the posterior.
E. Oxytocin (OT): Oxytocin is synthesized in the hypothalamus and stored/released by the posterior pituitary
Correct Answer is C
Explanation
A. A positive feedback loop: Positive feedback amplifies a response (e.g., oxytocin in labor); oxygen regulation requires balance, not amplification.
B. An enzymatic amplification: This refers to intracellular signaling cascades, not whole-body oxygen regulation.
C. A negative feedback loop: Hypoxemia stimulates chemoreceptors → increases respiratory drive → raises oxygen levels. Once oxygen is restored, stimulation decreases, demonstrating a classic negative feedback loop.
D. A self-amplifying mechanism: This is another way of describing positive feedback, which does not apply to oxygen regulation.
E. A cascade effect: Cascade effects occur in clotting or enzyme cascades, not in oxygen regulation.
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