Anatomy and physiology ch. 5 The Integumentary System Flashcards
functions of the skin
the functions of the skin are protection, sensation, temperature regulation, excretion, and vitamin D production.
Components of the skin
the skin consists of the epidermis and the dermis.
skin functions: protection
the skin protects against abrasion, uv, microorganisms, and water loss
functions of the skin: sensation
the skin has receptors that detect temp changes and touch/ pressure/ pain
Functions of the skin: Vitamin D production
when exposed to uv, the skin makes a molecule that can be turned into vitamin D
Functions of the skin: temperature regulation
the skin can change the amount of dilation in it’s vessels, and it can activate the sweat glands to regulate temperature
functions of the skin: excretion
small amounts of waste products are lost though the skin and in gland secretions
epidermis
the most superficial layer of the skin
dermis
a layer of connective tissue.
hypodermis
a layer of connective tissue connecting the dermis to the bone
layers of the epidermis
stratum corneum stratum luciduum stratum granulosum stratum spinosum stratum basale
stratum corneum
the highest layer of the epidermis, it has dead squamous cells that are keratinized
stratum lucidum
only found in thick skin of the palm and sole. this layer is composed of 3-5 layers of dead cells
stratum granulosum
this is the middle layer of the epidermis. it is 3-5 layers thick. cells pushed from below in this layer start to die.
statum spinosum
this layer of cells has a spiny appearance. this layer is composed of 8-10 layers of cell. these cell absorb melanin via phagocytosis
stratum basale
deepest layer of the epidermis. it is made up of a single row of actively dividing cells and is attached to the basement membrane. this layer contains skin stem cells, melanocytes, and keratinocytes.
dermis
consists of the papillary layer and the reticular layer
cleavage lines
lines of tension in the skin
papillary layer
projections that go up into the dermis, also the cause of fingerprints
reticular layer
makes up 80% of the dermis
hair bulb
living part of the hair