Lesson 3.2: Learning the Key Terms

stratum granulosum

a level of somewhat flattened cells, the _______________ lies just superficial to the stratum spinosum and inferior to the stratum

melanocytes

are special cells in the skin which produce melanin

merkel cells

are the skin's touch receptors

dermis

found between the epidermis and hypodermis, the _____________ also includes nerve endings, glands, and hair follicles

keratin

is a tough protein found in the skin, hair, and nails

sebum

is an oily substance that helps to keep the skin and hair soft

stratum lucidum

is the clear layer of thick skin found only on the palms of the hands, fingers, soles of the feet, and toes

reticular layer

is the coat of skin superficial to the papillary layer

integumentary system

is the enveloping organ of the body tha includes the epidermis, dermis, sudoriferous and sebaceous glands, plus hair and nails.

sebaceous glands

located all over the body, the ____________ produce sebum

sudoriferous glands

secrete sweat and are distributed in the dermis over the entire body

epidermal dendritic cells

the ________________________ initiate an immune system response to foreign bacteria or viruses

keratinocytes

the cells within the epidermis that make keritain are called ________________

stratum basale

the deepest layer of the epidermis is called the ________________

stratum corneum

the epidermis's outer layer is known as the _______________

stratum spinosum

the layer of cells in the epidermis superior to the stratum basale and inferior to the statum granulosum is called the ____________________

hypodermis

the layer of skin located under the dermis and known as the ___________, stores fat

papillary layer

the outer coat of the dermis is called the ___________________

epidermis

the outer layer of the skin is called the _______________

melanin

the pigment ___________ protects the bofy against the damagung effects of the sun's ultraviolet rays