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The body produces vitamin D when skin is directly exposed to the sun. This vitamin is essential for bone health.

Anemia is a condition where a person has a deficiency of red blood cells or hemoglobin, which can cause fatigue, weakness, and other symptoms.

The liver is the largest gland in the human body, weighing between 3 and 4 pounds in adults. The liver has many important functions, including filtering toxins from the blood, producing bile to aid in digestion, and storing nutrients such as vitamins and minerals.

The lens sits behind the iris and focuses light entering the eye onto the retina to create clear, sharp images.

Edward Jenner is known as the "father of immunology" for his pioneering work in developing a vaccine against smallpox using cowpox material.