Vitamin D production is stimulated by natural light and is regulated by skin melanin. Proper exposure to natural light means better:

Question

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The question asks about the relationship between natural light exposure, vitamin D production, and regulation by skin melanin, and what better exposure would influence.
Option A: Aldosterone function. Aldosterone is a hormone produced by the adrenal glands and involved in electrolyte balance and blood pressure regulation; it is not directly tied to vitamin D synthesis or the effects of sun exposure governed by skin melanin. This option misidentifies the physiological pathway most affected by sunlight-related vitamin D,
Option B: DNA function. While vitamin D can have downstream effects on gene expression, saying that better exposure directly improves DNA function is overly broad and ignores the primary role of sunlight-induced vitamin D, which is more specifically linked to mineral metabolism than to general DNA function.
Option C: Vitamin C production. Vitamin C is an essential nutrient obtained from diet and synthesized by some animals, but humans do not synthesize it; moreover, its production is not regulated by sun exposure or skin melanin. This makes the claim irrelevant to the sunlight–vitamin D context described in the question.
Option D: Calcium metabolism. Vitamin D plays a crucial role in calcium absorption from the gut and in maintaining calcium homeostasis, which directly impacts calcium metabolism. Since proper sun exposure increases vitamin D synthesis, the downstream effect is a stronger influence on calcium metabolism due to improved calcium absorption and utilization. This aligns with the well-established link between vitamin D status and calcium handling.
In summary, each option frames a different physiological function, but the core connection in the stem is between vitamin D production and a downstream process it directly influences. While only option D directly ties to the known role of vitamin D in calcium handling, the other options reference processes not primarily governed by vitamin D produced via sun exposure or are biologically unrelated to the described mechanism.

Biol 1106 Rosenzweig Sp2025 CRN's11552 & 11553 Final Exam Lessons 1-24 - Requires Respondus LockDown Browser

Vitamin D production is stimulated by natural light and is regulated by skin melanin. Proper exposure to natural light means better:

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