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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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) Hormonal: This refers to the stimulation of one endocrine gland by hormones released from another gland. GnRH from the hypothalamus stimulates the anterior pituitary to release LH/FSH, which then stimulate the ovaries to secrete estrogen. Thus, this is hormonal control.
b) Neural: Neural stimulation involves direct innervation (e.g., adrenal medulla stimulated by the sympathetic nervous system), which does not apply here.
c) Negative Feedback: This refers to a regulatory mechanism, not the initial cause of estrogen secretion. Estrogen can negatively feedback on GnRH, but that’s not the mechanism being asked.
d) Humoral: Humoral stimuli refer to changes in blood levels of ions or nutrients (e.g., calcium regulating PTH), not hormones.
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