Question

determine whether the scenario results in more or less vitamin d synthesis for people living in the united states.
labels
summer vs. winter
months
less vs. more time
the sun
dark skinned vs.
light skinned
older vs. younger
person
southern vs.
northern latitudes
drop zones
reset all
less vitamin d
synthesis (1/2)
more vitamin d
synthesis (2/2)

Explanation:

• Summer vs. winter months: In summer, there is more sunlight, so more vitamin D synthesis. In winter, less sunlight leads to less synthesis.
• Less vs. more time in the sun: More time in the sun means more UV - B exposure (needed for vitamin D synthesis), so more vitamin D. Less time, less synthesis.
• Dark - skinned vs. light - skinned: Dark - skinned individuals have more melanin which acts as a natural sunscreen. It scatters and absorbs UV - B rays, reducing vitamin D synthesis compared to light - skinned individuals.
• Older vs. younger person: As people age, the skin's ability to synthesize vitamin D from sunlight decreases. So, younger people synthesize more.
• Southern vs. northern latitudes: At southern latitudes, the sun is more direct (higher UV - B radiation), leading to more vitamin D synthesis. At northern latitudes, the sun's rays are more oblique (lower UV - B radiation), less synthesis.

Answer:

• Less vitamin D synthesis: Winter months, less time in the sun, dark - skinned, older person, northern latitudes.
• More vitamin D synthesis: Summer months, more time in the sun, light - skinned, younger person, southern latitudes.