anaphy

• Some collagen fibers are oriented in more directions than others, forming cleavage lines.
• An incision made parallel with these lines tends to gap less and produce less scar tissue.
• If the skin is overstretched for any reason, the dermis can be damaged, leaving stretch marks.
• The dermal papillae contain many blood vessels.
• The visible part of the nail is the nail body, and the part of the nail is covered by skin is the nail root.
• When the next growth stage begins, a new hair is formed and the old hair falls out.
• The duration of each stage depends on the individual hair.
• Hair is produced in the hair bulb, which rests on the hair papilla.
• Hair is formed by mitosis of epithelial cells within the hair bulb; these cells divide and undergo keratinization.
• The color of blood in the dermis contributes to skin color.
• A decrease in blood flow, as occurs in shock, can make the skin appear pale.
• Melanin is produced by melanocytes.
• The skin (cutaneous membrane) rests on the subcutaneous tissue.
• The dermal papillae in the palms of the hands, the soles of the feet, and the tips of the digits are arranged in parallel, curving ridges that shape the overlying epidermis into fingerprints and footprints.
• The acceptable percentage of body fat varies from 21% to 30% for females and from 13% to 25% for males.
• The subcutaneous tissue can be used to estimate total body fat.
• There are two kinds of sweat glands: eccrine and apocrine.