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 B
Explanation
a) The anterior pituitary produces testosterone from cholesterol and releases it when releasing hormones arrive from the hypothalamus.
Testosterone is produced in the testes, not the anterior pituitary.
b) The hypothalamus produces ADH and oxytocin which are stored in the posterior pituitary.
ADH and oxytocin are synthesized in the hypothalamus and then transported to and stored in the posterior pituitary until needed.
c) The posterior pituitary contains autonomic centers that exert neural control over the adrenal glands.
The hypothalamus, not the posterior pituitary, regulates the adrenal medulla via neural signals.
d) The thalamus produces ADH and oxytocin which are stored in the anterior pituitary.
The thalamus is a relay station for sensory signals, not a hormone-producing structure.
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.
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