During erythropoiesis in the bone marrow, which is the last cell to have a nucleus?
erythrocytes
normoblasts
proerythroblasts
reticulocytes
The Correct Answer is B
a) Erythrocytes: These are mature red blood cells and do not have a nucleus.
b) Normoblasts: A normoblast is the last stage of red blood cell development that still has a nucleus. Once the nucleus is ejected, the cell becomes a reticulocyte and then matures into an erythrocyte.
c) Proerythroblasts: This is an earlier precursor stage that still has a nucleus but is not the final nucleated form.
d) Reticulocytes: Reticulocytes are immature RBCs that lack a nucleus but still contain RNA remnants.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
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.
Correct Answer is B
Explanation
a) Is the vascular connection between the anterior pituitary and the hypothalamus: This describes the hypophyseal portal system, not the tract.
b) Is the neural connection between the hypothalamus and the neurohypophysis (posterior pituitary): The hypothalamic-hypophyseal tract consists of axons that transport oxytocin and ADH from the hypothalamus to the posterior pituitary for storage and release.
c) Conducts aldosterone to the hypophysis: Aldosterone is produced by the adrenal cortex and is not transported by this tract.
d) Is the site of prolactin synthesis: Prolactin is synthesized in the anterior pituitary, not in the hypothalamic-hypophyseal tract.
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