An Inch of Skin!. What do you think you’d find in one square inch of human skin? Write down a list of all the things that you think you might find. Think.

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Presentation transcript:

An Inch of Skin!

What do you think you’d find in one square inch of human skin? Write down a list of all the things that you think you might find. Think small. Very, very small.

In each square inch of human skin: (These are out of order. Try to guess at some of them!) How many hairs? How many cells? How many sweat glands? How many oil glands? How many blood vessels? How many nerves? How many nerve endings? How many heat sensors? How many cold sensors? How many pain sensors How many touch sensors? How many bacteria? 78 yards (70 meters) 650 9,500, , yards (17 meters) 32,000, ,

The correct order! How many hairs? How many cells? How many sweat glands? How many oil glands? How many blood vessels? How many nerves? How many nerve endings? How many heat sensors? How many cold sensors? How many pain sensors How many touch sensors? How many bacteria? 65 hairs 9,500,000 cells 650 sweat glands oil glands 19 yards of blood vessels 78 yards of nerves 19,500 nerve endings 78 heat sensors 13 cold sensors 1,300 pain sensors touch sensors 32,000,000 bacteria

The correct order! How many hairs? How many cells? How many sweat glands? How many oil glands? How many blood vessels? How many nerves? How many nerve endings? How many heat sensors? How many cold sensors? How many pain sensors How many touch sensors? How many bacteria? 65 hairs 9,500,000 cells 650 sweat glands oil glands 19 yards of blood vessels 78 yards of nerves 19,500 nerve endings 78 heat sensors 13 cold sensors 1,300 pain sensors touch sensors 32,000,000 bacteria