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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
a) Lumen of follicle: Iodide is actively transported into follicular cells, then secreted into the follicular lumen, where it becomes oxidized and incorporated into thyroglobulin during the synthesis of thyroid hormones (T3 and T4).
b) Secretory vesicles inside follicular cells: These vesicles may contain thyroglobulin, but iodide is concentrated in the lumen for hormone synthesis.
c) Golgi apparatus of parafollicular cells: Parafollicular (C) cells produce calcitonin, not thyroid hormones.
d) Cytoplasm of follicular cells: While iodide is transported into the cytoplasm briefly, its major functional location is in the lumen.
Correct Answer is C
Explanation
a) Hypercalcemia: High calcium levels inhibit PTH secretion via negative feedback.
b) Cold temperatures: PTH release is not influenced by ambient temperature.
c) Hypocalcemia: Low calcium levels stimulate the parathyroid glands to release PTH to increase calcium concentration.
d) Low basal metabolic rate: This relates more to thyroid hormone activity than to calcium regulation.
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