Bio 2 Lesson 2 Quarter 3

Integumentary System

Covering

Integument meaning

Nails, Skin, Hair, Glands

What are the components of integumentary system?

Protection, Sensation, Temperature regulation, Excretion, Vitamin D production, Respiration, Prevention of excessive loss of body fluid, Nourishment, Locomotion

Integumentary System Functions:
P

S

Tr

E

V _ P

R

P o e l o b f

N

L

Epidermis

This is the 1st major skin region (outside)

Epidermis

Composed of stratified squamous epithelium

Keratinization

process in which new cells (with keratin) push old cells to surface

40-56

How many days does it take for new cells to reach surface?

Stratum Corneum

outermost layers of flat, dead cells that are shed off at intervals

Stratum Corneum

responsible for variations in skin thickness

Stratum Lucidum

translucent layer where nails originate (palm of the hands, fingertips and sole of the feet)

Stratum Granulosum

several layers of cells filled with granules containing keratohyalin, nerve endings and epidermal pigments

Stratum Spinosum

layers with cells slightly separated by tissue fluid but joined by delicate extensions of cytoplasm (skin strength and flexibility)

Stratum Basale

layers of actively dividing cells which replaces the cells that are shed off

Stratum Basale

primarily made up of basal cell

Germinativum

Stratum Basale is also known as stratum ?

Melanin

Produced by melanocytes

Melanin

this gives the skin its color (ranges from yellow to reddish-brown to black)

lower epidermis

Melanin is found in ?

Melanin

responsible for hair and eye color

Melanin

provides protection against UV light

Melanin

amount produced determined by genetics, UV light, hormones

freckles

these are accumulation of melanin

albinism

absence of melanin

true

all races have same number of melanocytes (true or false)

pigments, genetics, blood circulation, thickness of stratum corneum

melanin is determined by what ?

Dermis

Composed of collagen and elastic fibers for strength and flexibility.

Dermis

Extremely vascular

Dermis

Contains abundant touch receptors

Dermis

Provides finger print patterns

Eccrine

tubular coiled glands that open in sweat pore on the surface of the skin secreting a clear fluid.

Apocrine

very large branched tubular glands found in axillary, mammary, and genital areas producing typical body odors.

Ceruminous

large branched glands usually opening through the hair sheaths along with sebaceous glands

Sebaceous

small alveolar glands usually formed close to hairs and opening on the upper portion of the hair follicle; absent on palms and soles

Mammary

milk secreting, compound alveolar glands which fully develop only during pregnancy

Eccrine, Apocrine, Ceruminous, Sebaceous, Mammary

What are the glands in the integumentary system?

Hair

Strands of tightly - packed dead and keratinized cells originating from the hair follicle

Arrector Pili

With this smooth muscle attached to it, its responsible for elevating the hair upon contraction