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) Hepatic portal system: This carries blood from the gastrointestinal tract to the liver, not the brain.
b) Coronary circulatory system: This system supplies the heart muscle, not involved in hormone transport from hypothalamus.
c) hypophyseal portal system: The hypophyseal portal system is a specialized vascular system that transports releasing and inhibiting hormones from the hypothalamus to the anterior pituitary.
d) Hypothalamus-hypophysial tract: This is a neural pathway used to transport ADH and oxytocin to the posterior pituitary, not the anterior.
Correct Answer is B
Explanation
a) Low level of iron concentration in the blood: Iron is necessary for hemoglobin synthesis, but it does not directly stimulate EPO production.
b) Low level of oxygen concentration in the blood: Hypoxia is the primary stimulus for EPO release, which then promotes red blood cell production to increase oxygen-carrying capacity.
c) Low number of red blood cells in the blood: While anemia can lead to hypoxia, it is the oxygen deficit (not RBC count itself) that directly stimulates EPO.
d) High number of red blood cells in the blood: This would decrease EPO production through negative feedback.
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