integumentary system

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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


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