The
The Correct Answer is {"dropdown-group-1":"B"}
A. Lymph nodes: Lymph nodes do undergo some changes with age but not as dramatically as the thymus.
B. Thymus: The thymus undergoes involution after puberty, shrinking in size and being replaced largely by fat, which significantly reduces T-cell production.
C. Spleen: While some function may decline with age, the spleen does not undergo the same marked involution as the thymus.
D. Pharyngeal tonsils: The tonsils may atrophy slightly with age, but the effect is less pronounced than with the thymus.
E. Appendix: The appendix may reduce in lymphoid tissue over time but does not exhibit the same profound involution.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Decrease in aldosterone production: Aldosterone regulates sodium and potassium levels, not calcium homeostasis.
B. Secretion of parathyroid hormone: PTH is released in response to low calcium levels. It increases calcium reabsorption from bone, the kidneys, and enhances activation of vitamin D to increase calcium absorption in the intestines.
C. Secretion of renin: Renin responds to decreased renal perfusion pressure or sodium levels, not calcium levels.
D. An increase in blood urea nitrogen: This may indicate renal dysfunction or dehydration, but it's not directly related to calcium levels.
E. Vasoconstriction of the afferent arterioles: Occurs in response to sympathetic stimulation or reduced perfusion, not hypocalcemia.
Correct Answer is D
Explanation
A. Trophoblast: Part of the blastocyst that contributes to placenta formation, not the whole developing individual.
B. Zygote: Single-cell stage immediately after fertilization.
C. Blastocyst: The hollow ball of cells that implants around day 6–7; occurs before week 3.
D. Embryo: The developing human is called an embryo from week 3 through week 8. This is when organ systems begin to form.
E. Fetus: The term "fetus" applies after week 8, when organogenesis is largely complete.
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