Skin, Hair and Nails: Lesson BWHS

​Weighs about 15% of your body weight

​largest organ of your body

​3 million sweat glands

​About 2 DVDs thick on average

​Thicker on the soles of your foot

​Thinnest on your eyelids

​top layer of skin is called epidermis- epi means above/on top

​20-50 layers of flat, DEAD cells

​as thick as a piece of a paper

​completely shed every 3-4 weeks

​and yes, makes up dust found in the air

​Pain receptors found in both layers of skin

freckles are clumps of melanin​

​1 square inch of skin contains: 10 hairs, 15 sebaceous glands, 100 sweat glands, 3 feet of tiny blood vessels

​Hair grows 1mm every 3 days

​100 hairs are lost a day

​Hair is made of same material as animal horns/ bird feathers

​Fingernails grow 3mm month but toenails grow a lot slower

​Small white crescent at base of your nail is called lunula since it looks like a moon

​Function of nails is to protect your fingers/toes