integumentary system
how much does the average person's hair grow weekly?
.5 inches
how much do your nails grow in a week?
.5mm
how thick is the skin?
1.5 to 5mm
about how much area does your skin cover?
2 square meters
how much does the average person's skin weigh?
20 lbs.
how many layers of skin are there?
3
how many sweat glands does an average person have?
300
how many skin cells does the average person have?
300 million
about how much bacteria lives in the sweat glands?
4 million
about how much skin do you shed annually?
9 lbs.
how often does the skin renew itself?
about every month
what is a skin doctor called?
dermatologist
what is the thickest layer of skin?
dermis
what is the thinnest layer of skin?
epidermis
what is the deepest layer of skin?
hypodermis
what is a hair doctor called?
trichologist
