body's outermost layer, which includes the skin, nails, hair, and glands. It functions to protect your body from the outside world.

largest organ

Animal weight skin

serving as an enclosing barrier and providing environmental protection, regulating temperature, producing pigment and vitamin D, and sensory perception.

the skin consists of the following structures:

It is the outermost layer of the skin and contains no blood cells

STRARA type

- Most superficial layer of the epidermis. - Several layers of dead, fattened keratinocytes.

- Found in thick skin (Kalyo) - Clear layer of dead keratinocytes

- Middle layer of the epidermis - 3-5 rows of cells - named for prominent granules - excretes a lipid based substance.

- Thickest stratum of the epidermis. - Named due to the spiky appearing cells. - help to synthesize vitamin D.

- deepest layer of the epidermis. - Richest supply of blood - Also known as Stratum Germinativum.

forms the inner layer of the skin and is much thicker than the epidermis (1-5mm)

How much thick is the dermis

Houses of blood supply.

Dermis: Layers

- Superficial layer - Consist of loose connective tissue - Collagen fibers anchor dermis and epidermis together.

- Blood vessels and accessory structures (hair, sweat glands and sebaceous gland) - Sensory receptors.

produced by melanocytes in the stratum basale.

Give color to the skin

- it gives yellow-orange pigment - Lipid-soluble molecule - usually ingested in diet.

- Gives pinkish hue in skin - Protein found in red blood cells.

Sensory neurons that contribute to the sensation to the environment.

HAIR STRUCTURE

project from the surface of the skin

tiny bands of smooth muscle that cause hair to stand up when they contract,

hair to stand up when they contract, this is known as?

Enfolding surrounding of the hair root.

structure at the deep end of the fair follicle.

– indentation at the base of the hair bulb that contains blood vessels.

- deliver essential nutrients and oxygen to the rapidly dividing cells in the hair bulb and follicle, ensuring the metabolic demands of active hair growth are met.

Are hard structures located at the end of digits that contain hard keratin.