Ferritin is a protein used to
store iron in the liver
absorb iron across intestinal cells
oxidize iron in the peroxisomes
transport iron in the blood
The Correct Answer is A
a) store iron in the liver: Ferritin is an intracellular protein that stores iron and releases it in a controlled fashion. It is primarily found in the liver, spleen, and bone marrow.
b) Absorb iron across intestinal cells: DMT1 (divalent metal transporter 1) and ferroportin are more directly involved in this.
c) Oxidize iron in the peroxisomes: Iron oxidation is not a function of peroxisomes, nor of ferritin.
d) Transport iron in the blood: Transferrin, not ferritin, is responsible for iron transport in plasma.
Nursing Test Bank
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 B
Explanation
a) Hypophysectomized rat treated with thyroxine: Thyroxine suppresses TSH; no goiter forms.
b) Hypophysectomized rat treated with TSH: TSH directly stimulates thyroid tissue growth, leading to goiter even if the pituitary is absent.
c) Thyroidectomized rat treated with PTU: No thyroid = no goiter can form, and PTU inhibits thyroid hormone production, not causing growth in absent tissue.
d) Thyroidectomized rat treated with TSH: Without thyroid tissue, TSH has no target to stimulate.
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