Place the following hormones in the correct order of their control, from first tier to third tier.
thyrotropin-releasing hormone (TRH) ->production of T3 and T4->thyroid-stimulating hormone (TSH)
thyroid-stimulating hormone (TSH) ->production of T3 and T4,->thyrotropin-releasing hormone (TRH)
thyroid-stimulating hormone (TSH)->thyrotropin-releasing hormone (TRH) ->production of T3 and T4
thyrotropin-releasing hormone (TRH)->thyroid-stimulating hormone (TSH) ->production of T3 and T4
The Correct Answer is D
a) TRH → production of T3 and T4 → TSH: Incorrect order; TSH stimulates T3/T4 production, not the other way around.
b) TSH → production of T3 and T4 → TRH: Incorrect; this reverses the hypothalamic-pituitary-thyroid (HPT) axis.
c) TSH → TRH → production of T3 and T4: Incorrect sequence; the hypothalamus releases TRH before the pituitary releases TSH.
d) thyrotropin-releasing hormone (TRH) → thyroid-stimulating hormone (TSH) → production of T3 and T4: This reflects the HPT axis: TRH is released by the hypothalamus (first tier). TSH is secreted by the anterior pituitary (second tier). T3 and T4 are produced by the thyroid gland (third tier)
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
a) Hypophysectomized rat treated with thyroxine: Thyroxine suppresses TSH; no goiter forms.
b) Hypophysectomized rat treated with TSH: TSH directly stimulates thyroid tissue growth, leading to goiter even if the pituitary is absent.
c) Thyroidectomized rat treated with PTU: No thyroid = no goiter can form, and PTU inhibits thyroid hormone production, not causing growth in absent tissue.
d) Thyroidectomized rat treated with TSH: Without thyroid tissue, TSH has no target to stimulate.
Correct Answer is B
Explanation
a) Erythrocytes: These are mature red blood cells and do not have a nucleus.
b) Normoblasts: A normoblast is the last stage of red blood cell development that still has a nucleus. Once the nucleus is ejected, the cell becomes a reticulocyte and then matures into an erythrocyte.
c) Proerythroblasts: This is an earlier precursor stage that still has a nucleus but is not the final nucleated form.
d) Reticulocytes: Reticulocytes are immature RBCs that lack a nucleus but still contain RNA remnants.
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