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Unit 5 Vocabulary

Epidermis Top layer of skin; For protection
Stratum Corneum Outer layer of the epidermis; Dead squamous cells (25 or more layers). Filled with keratin and lipids desmosome connections.
Stratum Granulosum (or granular layer) A thin layer of cells in the epidermis. Keratinocytes migrating from the underlying stratum spinosum become known as granular cells in this layer.
Cleavage Lines When more collagen fibers are oriented in some directions.
Dermis Layer of skin just below the epidermis. It is dense connective tissue.
Hair Shaft Above the surface of the skin.
Follicle (Bulb Matrix) Below the surface of the skin.
Stratum Basal Deepest layer of the epidermis. Cuboidal or columnar cells that divide every 19 days.
Nerve Receptor Specialized to sense or receive stimuli.
Sebaceous Gland Produce sebum; Oily and white substance composed of lipids.
Sweat Gland (Sudoriferous) Apocrine and merocrine; Largely water and salt.
Arrector Pili Muscles Smooth muscle cells that cause hair to stand up
Dermal Papilla Projections of the upper part of the dermis; Contain many blood vessels that supply the epidermis with nutrients. These are what form fingerprints and footprints in the epidermis.
Superficial Fascia (Hypodermis) Located under the dermis. It stores fat for padding and insulation.
Cutaneous Membrane An epidermis membrane.
Rickets (Vitamin D) A disease of children caused by vitamin D deficiency, characterized by imperfect calcification, softening, and distortion of the bones typically resulting in bow legs.
Keratin A fibrous protein forming the main structure of hair.
Melanin A dark brown to black pigment occurring in the hair, skin, and iris of the eye in people. It is responsible for tanning of skin exposed to sunlight.
Changes in Skin with Age Reduced blood flow to skin; Skin becomes thinner and more transparent; Decrease in the amounts of collagen fibers, so the skin is easily damaged and repairs slowly
Burns 1st degree- only the epidermis 2nd degree- damages the epidermis and dermis 3rd degree- completely damages the epidermis and dermis
Created by: BrittD2015