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Integumentary System Chapter 45. 4.

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Presentation on theme: "Integumentary System Chapter 45. 4."— Presentation transcript:

1 Integumentary System Chapter 45. 4

2 Integumentary System Hair Skin Nails

3 Functions Covers your body Retains body fluids
Protects against diseases Protects from injuries Eliminates waste products Regulates body temperature Produces Vitamin D

4 Skin Human body’s largest organ
Skin is capable of repairing itself through a lot of wear and tear throughout a lifetime Made up of layers Epidermis Dermis Subcutaneous

5 Epidermis Outer layer of the skin
Composed of many sheets of flattened, scaly epithelial cells TOP layer (corneal)of epidermis is mostly DEAD cells UNDERNEATH the top layer (basal) are living cells that are rapidly dividing

6 Epidermis cont’d Cells of the epidermis contain KERATIN
Protein that gives the skin its rough, leathery texture AND waterproof quality Cells also have MELANIN Brown pigment that gives skin its color Melanocytes are the melanin-producing cells Absorbs harmful UV radiation Darker skin is due to more melanin being produced Heredity and “tanning” Light skinned people need to be careful with UV radiation Can cause mutations in DNA, which lead to SKIN CANCER


8 Dermis Inner, thicker layer of the skin
Composed of living cells and specialized structures Sensory neurons Blood vessels Hair follicles Glands Nail

9 Sensory Neurons Allow you to sense conditions and signals from your environment Temperature Pressure Pain

10 Blood Vessels Allow blood to flow to your dermis, providing nourishment to your living cells

11 Hair Follicles Average adult has 5 million hairs on their body
Protects and insulates the body Hair follicle is the cavity deep in the dermis where the hair grows out from Tiny muscles are attached to your hair follicles Goosebumps Hair is actually composed of dead, keratin-filled cells that overlap each other like shingles on a roof Hair color is due to melanin Heredity


13 Glands Exocrine Glands-glands that release secretions through ducts
2 Main exocrine glands of the skin are OIL and SWEAT glands

14 Oil Glands Oil glands Prevent hair from drying out
Produce SEBUM-fatty substance Coats the surface to prevent water loss Softens skin and hair Can be toxic to some bacteria Production controlled by hormones Adolescence and increased hormones result in higher activity of oil glands Dead skin, bacteria and sebum cause ACNE

15 Sweat Glands Releases excess water, salts, and urea
Helps regulate body temperature Sweat is produced when body becomes hot As sweat evaporates, the body cools

16 Fat and Pores Fat is used to insulate body
Pores allow fluids to leave the body Sweat, Oil Oil or sweating clogging a pore can cause blackheads or pimples

17 Nails Protect the end of fingers and toes Composed mainly of keratin
Nails grow about 1mm per week Growth begins at nail root Nails rest on a nail bed which is composed of blood vessels, giving your nails their pink tint

18 Skin Diagram

19 Muscle and Integumentary Vocab Quiz Tomorrow (Friday)
Muscle and Integumentary Vocab Quiz Tomorrow (Friday)!!! Chapter 45 Quiz Monday!!!

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