Integumentary System

Integumentary system:- The integumentary syster is an igan system consisting of the skin hair, naile and exocrine glande. The skin is only a few millivreters thick yet is by far the largest organ in the body. The average person's skin weighs 10 pounds and has a surface are of alrest 20 square feet. Skin borius the body's outer covering and force o "barrier to protect the body from chemicals, disease. UV light and physical darrage. Hair and naile extent from the skin to reinforce the skin and protet it it from environmental Larrage. The exocrine glands of the integumentary system produce sweat oil and was to cool, protet and moistwice the skin's swipare Epidermics The epidermis is the Most superfici al layer of the skin that covers almost the entire body surface. The epidermics reste upon and protecte the deeper and thicker dernie layer of the skin. Structurally the epidermice is oneer about Only a teath of a millimeter thick but is made of 40 to 50 rows of stacked squamous epithelial celte. The epidermis is on avascular region of the body, Messing that it does not contain any blood The alls of the epiderrus epiderris Plieve all of their nutrients Ar blead veget Via diffusion Hypodermis "Deep to the derries is a loose connective tissus known as hypoderrie subcute or subutaneous tissue. The hypoderries stuves as a flexible connection beturer the skin and the underlying muscles and bones as well as fat storage are Dermis: The derris is the deep layer of the skin found under the epidermis. The derrid is mostly made up of dease irregular connective tissue along nervous tissue, blend and blood vessels. The desiring is much thicker than the epidfirius and gives the skin its strength and dasticity. Within the dermis there are twe distinct regions. the papillary layer" "and reticulas layer Hair- Haith is on accessory organ of the skin rade off columne of tightly porks) dead berdinoytes found in Mat regions of the body. Har helps to protect the body from UV radiation by presenting sunlight pror striking the skin. Hair alors insulates the body by trapping worry air around the skin. Naik Nails are accessory digons of the skin Made of sheets of hardened Keratinocytes and found on the distal ents and toenaile reinforce scraping of the fingers and tres. Fingernet and protect the end of the digite and are used for an Manipulating small objcite. There main parts of ate 3 Main a nail the root, body and free edge. The noil root is the portion of the nail found under surface of portion of the skin she nail boty is the nail. The free edge is the distal end. that has grown beyond the end of the visible externa portion of the nail the finger or toe Sudoriferous glands Sudoriferons glande are exocrine glands found in the derreis of the skin and commonly known as sweat glande. There are E Major typer of sndriperens glands: ecrine sweat glords and apocrine sweat glands. Eccrine sweat glande are found in almost every region of the skin and produce a secretion of water and sodium chloride. Ecorine sweat is delivered via a duct to the surfare off the surface of the skin and is used to lower the body's temperature through evaporative cooling. Subaceous glands Subaceous glands are exocrine glands found in the derris of the skin that produce an oily suretion known as sebur Subaccons glands are found in every part of the skin except for the thid skin of the palice of the hand and soles of the peet. Seburr i produced in the subaceous glande and carries through ducts to the surface of the skin or to hair follicles. Seburr acte to wateprief and increase the dasticity of the skin. deburr aleo lubricates and protests the cuticles of haire as they pass through the follicles to the exterior of the body. Ceruminous glands Ceruminous glands are special exocrine glands found only in the derrce of the ear canals. Ceruminous glands produce a wary secretion known as cerutres to protect the ear canals and lubricate the cordeus Ceruren protects the ear by trapping foreign material such as dust and as borne pathogens that enter the car conal. Cerurred is vrade continuously and slowly pusher older arvien outward towards the exterior of the cor cond where it falls out of the ear or is manually removed.