Sunlight and subcutaneous fat.
Skin synthesizes vitamin D when exposed to sunlight, which helps regulate calcium and phosphorus levels in the body. Skin also synthesizes a protein called keratin, which provides strength and protection to the outer layer of the skin.
Vitamins are substances which are not produced by the body, and therefore are necessarily obtained from the diet.
To produce vitamin D in a usable form, the skin, liver, and kidneys must work together. When the skin is exposed to sunlight, it synthesizes vitamin D3. This precursor then travels to the liver, where it is converted to calcidiol, and subsequently to the kidneys, which transform it into calcitriol, the active form of vitamin D that the body can utilize.
Skin, hair, gland, and nails. Provides protection, prevents water loss, synthesizes vitamin D, site receptors, and helps regulate body temperature through sweat evaporation.
The body synthesizes vitamin D primarily through exposure to ultraviolet B (UVB) rays from sunlight. When the skin is exposed to UVB radiation, it converts 7-dehydrocholesterol, a compound present in the skin, into previtamin D3, which is then transformed into active vitamin D (calcitriol) through further processes in the liver and kidneys. Additionally, vitamin D can be obtained from dietary sources and supplements.
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Your skin synthesizes vitamin D, which assists with calcium absorption. This calcium is part of the bone structure.
no
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The integumentary system acts as a barrier against pathogens, UV radiation, and dehydration, helping to protect the body from harmful external factors. It also plays a role in regulating body temperature and provides sensory information about the external environment through nerve receptors in the skin. Additionally, the integumentary system synthesizes vitamin D, which is important for multiple body functions.
Low vitamin D levels can be caused by several factors, including insufficient sun exposure, which is essential for the body's natural synthesis of the vitamin. Other contributing factors include a diet low in vitamin D-rich foods, certain medical conditions that affect absorption (like celiac disease or Crohn's disease), and obesity, which can sequester vitamin D in fat tissue. Additionally, older adults and individuals with darker skin may have reduced synthesis of vitamin D due to lower UVB absorption.
You do not use it consciously, but your body uses it (from sunlight) to generate vitamin D.