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 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.
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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