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Chapter 5

Integumentary System 5.1-5.2

Two layers of the skin Epidermis and dermis
Hypodermis They layer of tissue found beneath the skin.
Epidermis The thin outer layer of the skin.
Keratinocytes Produce keratin for waterproofing the skin. Found in the stratum basale.
Langerhans cells These cells are a type of white blood cell that aid in immunity and signaling the immune system.
Melanocytes A special cell that produces melanin. Melanin is the pigment that gives skin its color.
Tactile cells (Merkel Cells) These cells signal that something has touched the skin.
Dermis The dermis is a deep and thick region of the skin. The dermis contains collagen and elastic fibers that give skin its strength and ability to stretch.
Hypodermis This deep layer that lies beneath the skin is made of loose connective tissue, mostly fat, and this gives the body an energy supply, padding, and some degree of insulation.
Hair Follicle The region that a hair projects from.
Hair Matrix A constantly dividing region of cells that produces new keratinocytes to form new hair.
Alopecia Hair loss
Arrector pili A muscle found within the skin that causes hairs to stand up when someone is scared or cold. "Goose bumps"
Apocrine Glands These are a type of sweat gland that open to hairs in certain body regions including the groin and armpits.
Eccrine Glands A type of sweat gland that opens to the skin and secretes fluid when you are hot. Think "exercise=eccrine"
Ceruminous Glands Glands found in the ear that produce cerumen (earwax).
Sebaceous Glands These are glands that are associated with hairs.
Sebum An oily substance that lubricates and softens both skin and hair. Sebum also kills some bacteria.
Acne Vulgaris Inflammation of sebaceous glands.
Mammary Glands Modified apocrine sweat glands that produce milk, but only after childbirth.
Created by: Mr.Klein