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Integumentary System

Besides melanin, carotenes, xanthins, and blood can give skin various shades of color. The skin aids in activating Vitamin D, which is involved in aiding calcium absorption in the intestine and deposition in the bones and teeth. Melanin helps prevent too much Vitamin D formation, which could deform bones.

Another cell found in the epidermis is the Langerhans cell, which has an immune function.

Nutrients from the dermal blood vessels in the papillary area of the hair follicle nourish the hair. The hair itself is composed of keratin, a protein, which is also found in the epidermis. Melanin, iron compounds, sulfur and air bubbles give hair its color, ranging from black and brown to red, blonde, and gray.

The duct at the top is labeled correctly, but the portion labeled as an eccrine sweat gland is actually  dermal papillae containing Meissner's corpuscles. Read the description below of eccrine glands and look at the illustration below Table 6.3

What is the rule of nines, and how is it related to survival from burns?

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