What stimulates melatonin production?
increasing blood glucose levels
the light and dark cycles
the dysregulation of the immune system
increasing pigmentation of the skin
The Correct Answer is B
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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
a) Glucocorticoids: The zona fasciculata is the middle layer of the adrenal cortex. It primarily secretes glucocorticoids, mainly cortisol, which helps regulate metabolism, immune response, and stress adaptation.
b) Mineralocorticoids: Mineralocorticoids like aldosterone are produced in the zona glomerulosa, the outermost layer of the adrenal cortex.
c) Catecholamines: Catecholamines (e.g., epinephrine and norepinephrine) are produced in the adrenal medulla, not the cortex.
d) Androgens: Androgens (e.g., DHEA) are produced in the zona reticularis, the innermost layer of the adrenal cortex.
e) Epinephrine: Epinephrine is a catecholamine produced in the adrenal medulla. It is not produced in any zone of the adrenal cortex, including the zona fasciculata.
Correct Answer is A
Explanation
a) store iron in the liver: Ferritin is an intracellular protein that stores iron and releases it in a controlled fashion. It is primarily found in the liver, spleen, and bone marrow.
b) Absorb iron across intestinal cells: DMT1 (divalent metal transporter 1) and ferroportin are more directly involved in this.
c) Oxidize iron in the peroxisomes: Iron oxidation is not a function of peroxisomes, nor of ferritin.
d) Transport iron in the blood: Transferrin, not ferritin, is responsible for iron transport in plasma.
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