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Human integumentary system (SKIN)
Содержание
- 1. Human integumentary system (SKIN)
- 2. SKINHumans have a skin composed of one or more layersThe skin functions as a protective layer
- 3. The functions of skinprotection of the body
- 4. The functions of skingas exchangesensory reception (temperature,
- 5. Layers of skinSkin is composed of two completely different layers:Epidermis – outermost layer of bodyDermis
- 6. EpidermisIt is composed of keratinized epithelial cellsDo
- 7. DermisIt consists of collagen and elastin proteinsThe
- 8. DermisThe dermis contains smooth muscles, sweat and
- 9. Accessory structures of the skinThe accessory organs are:- Skin glands- Hair- Nails
- 10. Skin glandsThe skin includes two types of
- 11. Hair folliclesThe root of the hair in
- 12. NailsEach nail is composed of a nail
- 13. Скачать презентанцию
SKINHumans have a skin composed of one or more layersThe skin functions as a protective layer
Слайды и текст этой презентации
Слайд 2SKIN
Humans have a skin composed of one or more layers
The
skin functions as a protective layer
Слайд 3The functions of skin
protection of the body from physical and
chemical effects, ultraviolet, microbes
prevention of water loss
regulation of body temperature
In
hot conditions, capillaries in the skin dilate and radiate heat. The same capillaries constrict in cold conditions to prevent heat loss
Слайд 4The functions of skin
gas exchange
sensory reception (temperature, pain, pressure and
touch)
excretion of metabolic wastes via sweat glands
maintenance of a moist
body surfacesecretion of fat
absorption of some medicines
Слайд 5Layers of skin
Skin is composed of two completely different layers:
Epidermis
– outermost layer of body
Dermis
Слайд 6Epidermis
It is composed of keratinized epithelial cells
Do not contain blood
vessels
Upper section consists of non-living cells (contains protein keratin), about
0.7 mmThis layer is shed over a period of time and is replaced by the dividing cells of the inner layer
The color of the skin is conferred with melanin pigment
Слайд 7Dermis
It consists of collagen and elastin proteins
The dermis is rich
in blood vessels and nerve endings
The receptors located in the
skin are connected to the nerve endings
Слайд 8Dermis
The dermis contains smooth muscles, sweat and sebaceous (oil) glands,
hair follicles, touch receptors and lymph vessels
DRAW
Слайд 10Skin glands
The skin includes two types of glands: sebaceous glands
and sweat glands
Sebaceous glands produce oily secretions in order to
protect from microbesMainly located near hair
Not found on palm (ладонь) and sole (ступня)
Слайд 11Hair follicles
The root of the hair in the dermis is
termed the hair follicle, whereas the visible portion of it
is termed the hair shaftEach hair follicle has a sebaceous gland (сальная железа) and smooth muscle
Hair color is determined by pigment (melanin) produced by melanocytes located at the base of the hair follicle
Red color is determined by pigment trichosiderin
Слайд 12Nails
Each nail is composed of a nail plate (ногтевой пластины)
and a nail bed (ногтевое ложе)
The nail plate is a
continuation of the epithelium of the skinThe base of the plate resembles the shape of a half-moon and contains rapidly dividing epithelial cells
After division, impregnation (пропитывание) with keratin forms a horny (роговой) structure
