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How is iron stored in the liver as consequence of the recycling of the hemoglobin components?

A.

Ferritin

B.

Transferrin

C.

Hemosiderosis

D.

Ferrin

Answer and Explanation

The Correct Answer is A

a) Ferritin: Ferritin is a protein complex that stores iron in the liver, releasing it when needed.

b) Transferrin: Transferrin is the transport protein that carries iron in the blood, not a storage form.

c) Hemosiderosis: This is a pathological condition caused by excess iron deposition in tissues, not a normal storage mechanism.

d) Ferrin: “Ferrin” is not a physiologically recognized iron storage molecule.


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Related Questions

Correct Answer is D

Explanation

a) TRH → production of T3 and T4 → TSH: Incorrect order; TSH stimulates T3/T4 production, not the other way around.

b) TSH → production of T3 and T4 → TRH: Incorrect; this reverses the hypothalamic-pituitary-thyroid (HPT) axis.

c) TSH → TRH → production of T3 and T4: Incorrect sequence; the hypothalamus releases TRH before the pituitary releases TSH.

d) thyrotropin-releasing hormone (TRH) → thyroid-stimulating hormone (TSH) → production of T3 and T4: This reflects the HPT axis: TRH is released by the hypothalamus (first tier). TSH is secreted by the anterior pituitary (second tier). T3 and T4 are produced by the thyroid gland (third tier)

Correct Answer is C

Explanation

a) Hepatic portal system: This carries blood from the gastrointestinal tract to the liver, not the brain.

b) Coronary circulatory system: This system supplies the heart muscle, not involved in hormone transport from hypothalamus.

c) hypophyseal portal system: The hypophyseal portal system is a specialized vascular system that transports releasing and inhibiting hormones from the hypothalamus to the anterior pituitary.

d) Hypothalamus-hypophysial tract: This is a neural pathway used to transport ADH and oxytocin to the posterior pituitary, not the anterior.

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