Which is the fate of the iron (Fe3) that is released during the breakdown of damaged red blood cells and the recycling of the hemoglobin?
It is transported to the liver and becomes part of the bile
It is converted in stercobilin and gives color to the feces
It is used to synthesize proteins
It attaches to transferrin and is transported to bone marrow for use in hemoglobin synthesis
The Correct Answer is D
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.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
a) Decreased evidence of endocytosis: Endocytosis increases in hyperthyroidism as T3/T4 are actively removed from colloid.
b) Decreased evidence of lysosomal activity: Lysosomal activity increases to process thyroglobulin into active hormones.
c) A decrease in the size of the follicular cells: Follicular cells become taller (columnar) and more active, not smaller.
d) A decrease in the cross-sectional area occupied by the colloid: In hyperthyroidism (e.g., Graves' disease), the thyroid follicles are hyperactive, so colloid is used up rapidly, reducing the colloid area.
e) Decreased number of reabsorption lacunae: These increase in number as colloid is actively resorbed.
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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