Integumenatry System Flashcards Preview

Biology 101 > Integumenatry System > Flashcards

Flashcards in Integumenatry System Deck (24)
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1

skin

divided into two layers - dermis and epidermis

2

epidermis

five layers

3

stratum basale

deepest layers of the epidermis - a single row of cells

4

stratum spinosum

cells in this layer are alive
strands of keratin attache to the cells in this layers

5

stratum granulosum

three to five layers of flattened cells (keratinocytes)
cells are still alive but dying and decomposing a process called apoptosis which means programmed cell death

6

stratum lucidum

clear
consists of three to five layers of flattened clear dead cells (keratinocytes)
found in the thick skin of the fingertips, palms, and soles

7

stratum corneum

25 to 30 layers of flattened dead cells (keratinocytes)
continuously shed and replaced by cells from the deeper strata

8

dermis

two layers
gives the intgumentary system its strength and elasticity

9

papillary layer

superficial portion of the dermis
responsible for skin lines and finger prints
provide blood and nutrients necessary for the regeneration of skin cells to the epidermis

10

reticular layer

deepest layer of the dermis
consists of thick, elastic collagen fibers bound into a three demisional lattice
primarily responsible for the strenght and elasticity of the integumentary system

11

accessory structures

hari, skin glands, and nails

12

hair

found in the thinner skin of the body
the root is located in the dermis or the subcutaneous tissue below the dermis
follicles pass through the layers and regions of the integumentary system

13

arrector pilli muscles

small muscles attached to hair follicles
these muscles contract in response to cold or fear which pulls the hair shafts perpendicular to the skin surface (goosebumps)

14

skin glands

sebaceous glands, sudoriferous glands, ceruminous glands

15

sebaceous glands

secrete oily fluid called sebum that coats hair follicles
when inflamed cause acne

16

sebaceous gland function

aid in waterproofing the skin
keeps skin soft and pliable
inhibits growth of some bacteria

17

sudoriferous glands

apocrine sweat glands and eccrine sweat glands

18

apocrine sweat glands

located mainly in the skin of the armpit, pubic region and the pigmented area around the nipples of the breast
secretes odorless fluid that can coat hari follicles or be deposited directly on the skin
interacts with bacteria meabolizes causing it to produce and odor
stimulated during emotional stress and sexual excitement

19

eccrine sweat glands

more common
located throughout the skin except for the lips, nails, and genital regions - most numerous in palms of the hands and the soles of the feet
secretes same as apocrine minus proteins and lipids
help regulate body temp through evaporation of sweat

20

sweat

fluid produced and secreted by both sweat glands
helps regualate body temp by acting as ca cooling mechanism and produces characterisitc body odor

21

ceruminous glands

modifed sweat glands in the external ear
secetory portion lies in the subcutanous layer
produces ear wax (sticky barrier that impedes the entrance of foreign bodies)

22

nails

protective coverings on ends of fingers and toes

23

nail body

hard, dead, kertinized epidermal cells that form a clear covering oer the dorsal surface of the distal portion of digits

24

naid beds

secures the nail to fingertips