What stimulates the release of parathyroid hormone (PTH)?
hypercalcemia
cold temperatures
hypocalcemia
low basal metabolic rate
The Correct Answer is C
a) Hypercalcemia: High calcium levels inhibit PTH secretion via negative feedback.
b) Cold temperatures: PTH release is not influenced by ambient temperature.
c) Hypocalcemia: Low calcium levels stimulate the parathyroid glands to release PTH to increase calcium concentration.
d) Low basal metabolic rate: This relates more to thyroid hormone activity than to calcium regulation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
a) Ferritin: Ferritin is a protein complex that stores iron in the liver, releasing it when needed.
b) Transferrin: Transferrin is the transport protein that carries iron in the blood, not a storage form.
c) Hemosiderosis: This is a pathological condition caused by excess iron deposition in tissues, not a normal storage mechanism.
d) Ferrin: “Ferrin” is not a physiologically recognized iron storage molecule.
Correct Answer is B
Explanation
a) Increasing blood glucose levels :Melatonin is not directly regulated by glucose.
b) The light and dark cycles: Melatonin secretion by the pineal gland is regulated by the suprachiasmatic nucleus in response to light exposure. Darkness stimulates its release, promoting sleep.
c) The dysregulation of the immune system :While melatonin has immune-modulating roles, this is not its main regulatory mechanism.
d) Increasing pigmentation of the skin :Melanin and melatonin are different substances.
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