Lab Test 1 CH6 Flashcards
skin and its derivatives: nails, hair, sweat glands, and sebaceous (oil) glands
Components of the integumentary system
another name for the integument
Cutaneous membrane
Two distinct layers– a layer of stratified squamous epithelium called the epidermis, and a deeper layer of primarily dense irregular connective tissue called the dermis
layers that make up the integument
connects and nourishes the epidermis, produces sweat and oil
function of dermis
protection
function of epidermis
What is the epidermis composed of
keratinized, stratified squamous epithelium
What is the dermis composed of
Dense irregular connective tissue
What is another name for the hypodermis
Subcutaneous layer
What are the layers from deep to superficial of the epidermis
stratum basale, stratum spinosum, stratum granulosum, stratum lucidum (found in thick skin only), and the stratum corneum
What is another name for stratum basale
Basal layer
What are epidermal dendtric cells (dendritic) know for
Immune cells that fight infection in the epidermis
Where the keratinocytes fill up with the protein keratin, and in so doing, cause both the cell’s nucleus and organelles to disintegrate and the cell dies
keratinization
What is another name for stratum lucidum
Clear layer
Where is the stratum lucidum found
Thick skin in hands and feet, protects from UV rays
number of epidermal strata and the relative thickness of the epidermis
Classification of skin as either thick or thin
life expectancy of an epidermal cell
About 4 weeks
Where is thin skin found
Covers most of the body
Where is thick skin found
Palms of hands and soles of feet
Projections of the dermis in the papillary layer of the dermis
dermal papillae
What is the papillary layer of the dermis composed of
Areolar connective tissue
Composed of dense irregular connective tissue surrounding hair follicles, sebaceous glands and sweat glands, nerves, and blood vessels
reticular layer of the dermis
What is the subcutaneous layer composed of
Areolar and adipose connective tissue
nails, hair, and exocrine glands of the skin
integumentary structures are derived from the epidermis
A single hair
pilus
What are the two most common types of exocrine glands
Sudoriferous glands and sebaceous glands
Clear secretion released by exocytosis called sweat
merocrine gland secretion
Viscous and cloudy liquid containing both proteins and lipids that are acted upon by bacteria to produce a distinct, noticeable odor called pheromones
apocrine gland secretion
An oily, waxy secretion called sebum
sebaceous gland secretion
Around hair follicles to keep skin and hair from becoming dry and cracked
sebaceous gland location
