Integumentary system Quiz

33 terms by Artyfer

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Skin

large waterproof covering. UV light and chemical protection

Accessory structures

hair, nails, glands

Epidermis

upper layer. Composed of (The stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, and stratum germinativum)

Dermis

lower layer

Keratinization

cells move to surface, lose water and nuclei change

The Stratum Corneum

outermost layer. Dead, keratinized cells. Barrier to light, heat, chemicals, microorganisms

The Stratum Lucidum

one to two cell layers thick. Flat and transparent. Difficult to see

The Stratum Granulosum

two or three layers. Flattened cells. Active keratinization. Lose nuclei. Compact and brittle

The Stratum Spinosum

several layers of spiny-shaped cells

Desmosomes

interlocking cellular bridges

The Stratum Germinativum

rests on basement membrane. Lowermost layer called stratum basale. New cells produced here (mitosis).

Melanocytes

produce melanin

Structures Found in Dermis

blood and lymph vessels, Nerves, Muscles, Glands, Hair follicles

Divisions of the Dermis

papillary, reticular, subcutaneous

Papillary

adjacent to the epidermis

Reticular

between papillary and subcutaneous

Subcutaneous (hypodermis)

layers of fat below the dermis

Hair

covers most of the surface of the body. Three parts - cuticle, cortex, medulla. Consist of Shaft, Root, and Arrector pili.

Shaft

visible portion

Root

hair follicle

Arrector pili

smooth muscle

Nails

modified epidermal cells. Consist of Lunula, body, root. Growth occurs from the nailbed

Lunula

white crescent

Body

visible portion

Root

covered by skin

Glands

Sebaceous and Sweat

Sebaceous

produce sebum (oil). Secretion controlled by endocrine system

Sweat

most numerous in palms and soles. Sweating helps cool the body

Functions of the Integumentary System

sensation, protection, thermoregulation, secretion.

Sensation

hot, cold, pressure

Protection

light, heat, water loss, foreign substances

Thermoregulation

blood vessel dilation and sweating

Secretion

sebum, sweat, Vitamin D

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