Which white blood cell is primarily responsible for producing antibodies?
Monocytes
Neutrophils
B lymphocytes
T lymphocytes
The Correct Answer is B
A. Monocytes: Monocytes differentiate into macrophages and dendritic cells that perform phagocytosis and antigen presentation but do not produce antibodies.
B. Neutrophils: Neutrophils are short-lived phagocytic cells that ingest and destroy pathogens; they do not produce antibodies.
C. B lymphocytes: B lymphocytes (B cells) differentiate into plasma cells that secrete antibodies specific to antigens, making them the primary source of antibody production.
D. T lymphocytes: T lymphocytes are involved in cell-mediated immunity, regulating immune responses and directly killing infected cells but not in producing antibodies.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Thyroid-stimulating hormone (TSH):TSH is secreted by the anterior pituitary and targets the thyroid gland to stimulate thyroid hormone production, not the adrenal cortex.
B. Adrenocorticotropic hormone (ACTH):ACTH is secreted by the anterior pituitary and stimulates the adrenal cortex to produce glucocorticoids such as cortisol.
C. Growth hormone (GH):GH is secreted by the anterior pituitary and primarily acts on growth and metabolic processes, not directly to stimulate the adrenal cortex.
D. Prolactin:Prolactin is secreted by the anterior pituitary and primarily stimulates milk production in the mammary glands rather than the adrenal cortex.
Correct Answer is D
Explanation
A. Negative feedback from insulin inhibits GH release from the anterior pituitary.:Insulin does not play a primary role in negative feedback on growth hormone release; GH regulation involves GHRH, somatostatin, and IGF-1 feedback.
B. Positive feedback from cortisol increases CRH release from the hypothalamus.:Cortisol typically exerts negative feedback on CRH (and ACTH) release, reducing hypothalamic CRH secretion rather than increasing it.
C. Positive feedback from aldosterone increases ACTH release from the anterior pituitary.:Aldosterone secretion is primarily regulated by the renin–angiotensin system and potassium levels, and aldosterone does not typically provide positive feedback to increase ACTH.
D. Negative feedback from thyroid hormones inhibits TRH release from the hypothalamus.:Thyroid hormones (T3/T4) exert negative feedback on both the hypothalamus and anterior pituitary, decreasing TRH and TSH secretion respectively.
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