Which hormone starts the melanin production process?

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Multiple Choice

Which hormone starts the melanin production process?

Explanation:
Melanogenesis begins when melanocytes are stimulated by melanocyte-stimulating hormone. When MSH binds to melanocortin-1 receptors on melanocytes, it activates signaling pathways that boost tyrosinase activity—the key enzyme that starts converting tyrosine into melanin. This melanin is produced in melanosomes and then transferred to nearby keratinocytes, giving skin its color and helping shield it from UV radiation. MSH comes from the same precursor as ACTH (POMC) and can increase with UV exposure, linking sunlight to more pigmentation. Other hormones like ACTH, LH, and TSH regulate different endocrine targets and do not directly trigger melanin production in melanocytes.

Melanogenesis begins when melanocytes are stimulated by melanocyte-stimulating hormone. When MSH binds to melanocortin-1 receptors on melanocytes, it activates signaling pathways that boost tyrosinase activity—the key enzyme that starts converting tyrosine into melanin. This melanin is produced in melanosomes and then transferred to nearby keratinocytes, giving skin its color and helping shield it from UV radiation. MSH comes from the same precursor as ACTH (POMC) and can increase with UV exposure, linking sunlight to more pigmentation. Other hormones like ACTH, LH, and TSH regulate different endocrine targets and do not directly trigger melanin production in melanocytes.

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