Which of the following precursor cells eventually give rise to the platelets?
Megakaryoblast
Proerythroblast
T lymphoblast
Monoblast
The Correct Answer is A
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.
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Related Questions
Correct Answer is D
Explanation
a) It is transported to the liver and becomes part of the bile: This applies to bilirubin, a byproduct of heme, not iron.
b) It is converted into stercobilin and gives color to feces: Stercobilin is derived from bilirubin, not iron.
c) It is used to synthesize proteins: While iron is important in protein function, its primary fate is recycling for hemoglobin.
d) It attaches to transferrin and is transported to bone marrow for use in hemoglobin synthesis. Iron is bound to transferrin in the blood and transported to the bone marrow for new red blood cell (hemoglobin) synthesis.
Correct Answer is C
Explanation
a) Mineralocorticoids
These are produced in the zona glomerulosa, not the zona fasciculata.
b) Androgens
Androgens are primarily produced in the zona reticularis.
c) Glucocorticoids
The zona fasciculata is the middle layer of the adrenal cortex and produces glucocorticoids, such as cortisol.
d) Estrogens
Estrogens are not produced by the adrenal cortex in significant amounts; they are mainly produced in the ovaries.
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