BLG 101 Chapter 5
integumentary system consists of - answerskin, hair, nails, sweat glands, sebaceous
(oil) glands
Epidermis - answerthe superficial layer of the skin
consist mostly of keratinized stratified squamous epithelium
- is avascular
Demis - answerunderlies epidermis
-vascular
-supplies nutrients to epidermis
-connective tissue
-includes fibroblasts, macrophages and sometimes white Blood cells
- contains fibres in the matrix
-contains nerves, blood vessels and lymphatic vessels
Contian epidermal hair follicles, oil glands and sweat glands
Hypodermis - answersubcutaneous layer,
this is a layer of *fat located under the dermis of the skin.
The hypodermis helps to insulate the body and protects underlying muscles and other
structures.
Keratinocytes - answerproduce keratin
tightly connected by desmosomes
Melancytes - answerproduce melanin, which is packaged into melanosomes\
-melanosomes transfer keratinocytes, where they protect the nucleus from UV damage
Dendritic cells - answerSupport immune system
specialized white blood cells that patrol the body searching for antigens that produce
infections
Tactile Cells - answersensory Neurons
touch and feel
, layers of epidermis
(Come Lets Get Sun Burnt) - answerCorneum
Lucidum
Granulosum
Spinosum
Basale
stratum basale - answerDeepest layer
firmly attached to the dermis
highly vascular
row of stem cells that divide
produces skin cells
stratum spinosum - answerSeveral layers thick
contains prekeratin filaments attached is desmosomes
-allows them to resist tension and pulling
gives skin integrity
stratum granulosum - answerthin layer of flatted cells i
cells appearance changes
-Nuclei and organelles disintegrate
- keratinization beings
cells slow water lose
cells above this layer die
they are starting to die at this time
stratum lucidum - answerfound only in thick skin
appears glassy
so packed
dead keratinocytes
stratum corneum - answerseveral row of flat, non nucleates, keratinized dead cells
3/4 of epidermis thickness
protect
prevent water loss
protect from abrasion and penetation
barrier
Apoptosis - answercell death
Papillary - answerSuperficial layer of areolar connective tissue consisting of loose,
interlacing collagen and elastic fibres and blood vessels.
Loose fibres allow phagocytes to patrol for microorganisms
enhances grip
contributes to sense of touch
sweat pores
integumentary system consists of - answerskin, hair, nails, sweat glands, sebaceous
(oil) glands
Epidermis - answerthe superficial layer of the skin
consist mostly of keratinized stratified squamous epithelium
- is avascular
Demis - answerunderlies epidermis
-vascular
-supplies nutrients to epidermis
-connective tissue
-includes fibroblasts, macrophages and sometimes white Blood cells
- contains fibres in the matrix
-contains nerves, blood vessels and lymphatic vessels
Contian epidermal hair follicles, oil glands and sweat glands
Hypodermis - answersubcutaneous layer,
this is a layer of *fat located under the dermis of the skin.
The hypodermis helps to insulate the body and protects underlying muscles and other
structures.
Keratinocytes - answerproduce keratin
tightly connected by desmosomes
Melancytes - answerproduce melanin, which is packaged into melanosomes\
-melanosomes transfer keratinocytes, where they protect the nucleus from UV damage
Dendritic cells - answerSupport immune system
specialized white blood cells that patrol the body searching for antigens that produce
infections
Tactile Cells - answersensory Neurons
touch and feel
, layers of epidermis
(Come Lets Get Sun Burnt) - answerCorneum
Lucidum
Granulosum
Spinosum
Basale
stratum basale - answerDeepest layer
firmly attached to the dermis
highly vascular
row of stem cells that divide
produces skin cells
stratum spinosum - answerSeveral layers thick
contains prekeratin filaments attached is desmosomes
-allows them to resist tension and pulling
gives skin integrity
stratum granulosum - answerthin layer of flatted cells i
cells appearance changes
-Nuclei and organelles disintegrate
- keratinization beings
cells slow water lose
cells above this layer die
they are starting to die at this time
stratum lucidum - answerfound only in thick skin
appears glassy
so packed
dead keratinocytes
stratum corneum - answerseveral row of flat, non nucleates, keratinized dead cells
3/4 of epidermis thickness
protect
prevent water loss
protect from abrasion and penetation
barrier
Apoptosis - answercell death
Papillary - answerSuperficial layer of areolar connective tissue consisting of loose,
interlacing collagen and elastic fibres and blood vessels.
Loose fibres allow phagocytes to patrol for microorganisms
enhances grip
contributes to sense of touch
sweat pores
