The Integumentary System (the skin)

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Presentation transcript:

The Integumentary System (the skin) Chapter 13.4

Functions of the Skin Temperature Regulation Sensation Blood Reservoir Sweat glands Sensation Root hair plexuses Pain and heat/cold receptors Blood Reservoir Shunts more blood into the circulation when needed. Excretion Vitamin D Production Protection for the Body

- The Skin The Epidermis The skin is organized into two main layers: the epidermis and the dermis.

Epidermis Outermost layer. Composed mostly of keratin Contains 4 distinct cell types and 4 to 5 distinct layers. Outer layer is dead cells Skin color—determined by melanin (pigment), carotene, and hemoglobin. Freckles & moles

The Dermis Made mostly of connective tissue. The hide of the human body. Contains the hair follicles, sweat glands, oil glands, lymphatic vessels, and many sensory receptors. Layer of fat under the dermis