Integumentary system Flashcards
The integumentary system…
consists of skin, hair, nails and exocrine glands
Skin is the…
largest organ, its thickened, keratinised epithelium
Functions of the skin (3):
protective barrier
communication to the brain via sensory receptors
regulates core body temp - sweating, vasodilation.
The skin is made up of 2 layers:
Outer, superficial layer - epidermis
Underlying layer - dermis
innermost layer - hypodermis
Epidermis consists of:
Sweat gland ducts
keratinocytes
Melanocytes
Langerhans
Epidermis’ supply:
the epidermis is avascular so receives it nutrients via fluids from diffusion from the dermis
Dermis is made up of…
2 layers. The outer papillary and the inner reticular.
The dermis consists of structures such as…
herbaceous glands
hair follicles
blood vessels
temp + pressure receptors
The lower reticular has…
gland roots and dense connective tissue.
The outer papillary has…
glands.
The dermis gives the skin…
strength and elasticity.
Hypodermis layer is mainly … for … and …
adipose tissue
insulation and shock absorption
Why is Vitamin D important?
UV light - VD - allows absorption of Ca2+ from food - muscle contraction
Skin colour is controlled by 3 pigments:
melanin, carotene and haemoglobin
Sebaceous gland is…
an oil producing gland
