Ch.4 exam 4
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Ch.4 exam 4
What is the INTEGUMENTARY SYSTEM composed of?
What are the functions of the EPIDERMIS?
protect dermis form trauma
control skin permeability
prevent entry of pathogens
synthesize vitamin D
sensory receptors to detect touch, pressure, pain, and temp
coordinates immune system response
What are the layers of the DERMIS?
papillary layer and recticular layer
What are the functions of the PAPILLARY LAYER of the dermis?
nourish and support the epidermis
What are the functions of the RECTICTULAR LAYER of the dermis?
restricts spread of pathgens
attaches skin to deeper tissues
blood vessels to assist in thermoregulation
What do the SENSORY RECEPTORS of the RECTICULAR LAYER detect?
What are the functions of HAIR FOLLILES?
produce hairs that protect skull
produce hair that provide delicate touch sensations
What are the functions of EXOCRINE GLANDS?
assist in thermoregulation
What are the functions of the INTEGUMENTARY SYSTEM?
reguklation of body temp
What is the SKIN and its layers?
epidermis and dermis
Describe the EPIDERMIS.
*does not have blood vessels
**relys on dermis
*has blodd vessels
What are KERATINOCYTES?
What are MELANOCYTES? where are they found? function?
protect from UV radiation
deep in epidermis
What are MERKEL CELLS?
What are LANGERHANS CELLS?
What are the EPIDERMAL LAYERS from deep to most superficial?
Characteristics of the STRATUM BASALE
attached to basal lamina
has epidermal stem cells
and merkel cells
Characteristics of the STRATUM SPINOSUM.
keratinocytes bound together by maculae
langerhans cells and melanocytes
Characteristics of the STRATUM GRANULOSUM.
1-2 layers thick
keratin fibers develop as cells become thinner
cells membrane thickens
Characteristics of the STRATUM LUCIDUM.
1 cells thick
appears as glassy layer in thick skin
Characteristics of the STRATUM CORNEUM.
multiple layers of flat, dead interlocking keratinocytes
water resistant but not water proof
permits slow water loss
What is HAIR?
extends beyond surface of skin
98% NOT on head
What are HAIR FOLLICLES?
organs that form hairs, alive
Functions of SEBACEOUS GLANDS.
secrete oily lipids that coat hair shaft and epidermis
provide lubrication and antibacterial action
Functions of SWEAT GLANDS.
produce watery solution by merocrine secretion
flush epidermal surface
Types of SEBACEOUS GLANDS and how they secrete.
Typical (secrete into hair follicles)
Sebeceous Follicles (secrete onto skin surface)
Types of SWEAT GALNDS.
Apocrine aka ODORIFEROUS
Describe ODORIFEROUS (apocrine) SWEAT GLANDS.
limited distribution (axillae, groin, nipples)
produce secretion of complex composition
strongly influenced by hormones
Describe MEROCRINE SWEAT GLANDS.
produce thin secretions, mostly water
merocrine secretion mechanism
contolled by nervous system
role in thermoregulation and excretion
What is ACELLULAR SCAR TISSUE the result of?
the inability to completely heal after severe damage