33.3 Integumentary System

KEY CONCEPT The integumentary system has many tissues that protect the body.

33.3 Integumentary System

The integumentary system helps maintain homeostasis.

• The integument is the body system that surrounds all your other organ systems.

33.3 Integumentary System

The integumentary system helps maintain homeostasis.

• The integumentary system consists of many parts.– skin– hair– nails– oil glands– sweat glands– proteins,

such as keratin

33.3 Integumentary System

• Integumentary system removes substances from the body.– water– salts– urea

pore

sweatglands

33.3 Integumentary System

• The outermost layer of the skin is the epidermis.– dead skin cells– oils– pores

The integumentary system consists of many different tissues.

epidermis

pore

33.3 Integumentary System

– Keratin makes cells waterproof and tough feeling.

• Cells in the epidermis produce keratin and melanin.

– Melanin is a dark pigment that absorbs UV rays.

33.3 Integumentary System

– sweat glands– oil glands– pressure receptors– blood vessels– hair follicles

• The dermis contains most of the tissues in the skin.

dermis

hair follicle

oil gland

pressurereceptors

sweat gland

33.3 Integumentary System

• The dermis also produces elastin and collagen.

• A hair follicle is pit of cells that produces hair.

– Elastin makes skin flexible.– Collagen gives skin its shape.

33.3 Integumentary System

• Beneath the dermis is a layer of fat.

fat layer