What is a function of calcitonin?
Accelerates Ca2+ release from bone
Stimulates Ca2+ excretion by the kidneys
Increases Ca2+ deposition in bone
Stimulates the formation of calcitriol in the kidneys
The Correct Answer is C
a) Accelerates Ca²⁺ release from bone: This is a function of parathyroid hormone (PTH), not calcitonin.
b) Stimulates Ca²⁺ excretion by the kidneys: While calcitonin may promote calcium excretion slightly, its main action is on bone, not the kidneys.
c) Increases Ca²⁺ deposition in bone: Calcitonin, secreted by the thyroid gland’s parafollicular (C) cells, lowers blood calcium by inhibiting osteoclast activity and enhancing calcium deposition in bones.
d) Stimulates the formation of calcitriol in the kidneys: This is primarily a function of PTH, which promotes the synthesis of active vitamin D (calcitriol) in the kidneys
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
a) Mineralocorticoids
These are produced in the zona glomerulosa, not the zona fasciculata.
b) Androgens
Androgens are primarily produced in the zona reticularis.
c) Glucocorticoids
The zona fasciculata is the middle layer of the adrenal cortex and produces glucocorticoids, such as cortisol.
d) Estrogens
Estrogens are not produced by the adrenal cortex in significant amounts; they are mainly produced in the ovaries.
Correct Answer is B
Explanation
a) Hemoglobin: Hemoglobin is the oxygen-carrying protein inside RBCs, measured in grams per deciliter.
b) Hematocrit: Hematocrit is the percentage of whole blood volume made up by red blood cells (RBCs). It's used to assess anemia or polycythemia.
c) Erythropoietin: This is a hormone (mostly from the kidneys) that stimulates RBC production in the bone marrow.
d) Erythrocyte sedimentation rate: This test measures how quickly RBCs settle in a test tube, used as a nonspecific marker for inflammation.
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