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) Megakaryoblast: The megakaryoblast is the precursor cell in the bone marrow that eventually becomes a megakaryocyte, which fragments to form platelets (thrombocytes).
b) Proerythroblast: This cell gives rise to red blood cells (erythrocytes), not platelets.
c) T lymphoblast: This is a precursor to T lymphocytes, part of the adaptive immune system.
d) Monoblast: This cell gives rise to monocytes, which become macrophages in tissues.
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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