When part of the skin is exposed to great deal of friction, such as when part of

Question

When part of the skin is exposed to great deal of friction, such as when part of your foot rubs against your shoe, a blister often forms.

a blister is a collection of fluid that accumulates between two layers of the skin as they separate from each other. Which two layers of the skin are these? ___________________ and ________________

b. When you pull the outer layers of skin off a blister, exposure of underlying tissue causes a great deal of pain. What type of sensory receptor is responsible for sensation of this pain?

c. Why is the pain worse after removal of the outer layer of the blister?

Explanation / Answer

a. The two layers of the skin are epidermis and dermis.

Epidermis is the upper layer of the skin while dermis is the lower layer.

b. Nociceptor is the sensory receptor responsible for such pain.

This receptor is mainly stimulated by injury.

c. Pain is worse after removal of outer layer because once the outer layer is removed the blister becomes an open wound. An open wound is irritated by surrounding factors and thus is more painful than before.

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