1 / 7

The Integumentary System

The Integumentary System. Integumentary System. The Body Covering Includes: Skin, Nails & Hairs Skin A.K.A. C utaneous Membrane Functions : Body Temperature R egulation : Sweating at surface and adjusting blood flow in dermis.

dunne
Download Presentation

The Integumentary System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Integumentary System

  2. Integumentary System • The Body Covering • Includes: Skin, Nails & Hairs • Skin A.K.A. Cutaneous Membrane • Functions: • Body Temperature Regulation: Sweating at surface and adjusting blood flow in dermis. • Protection: Keratin protects from microbes, abrasions, heat and chemicals, lipids slow evaporation of water, melanin protects from UV rays. • Cutaneous Sensations: Sensory input/output • Excretion and Absorption: Eliminates substances, passage of materials into body cells (drugs) • Synthesis of Vitamin D: UV light activates creation of Vit D

  3. Structure • Skin is divided into two main parts: • Epidermis(epi = above) Surface epithelial layer • Dermis: Deeper connective tissue layer • Subcutaneous Layer Deep dermis not part of the skin. • Fibers from dermis anchor skin to this layer which then allows for attachment to other tissue and/or organs.

  4. Epidermis • Made of keratinized stratified squamous epithelium • Capable of regeneration (new cells ~ q4 weeks) • 4 cell types: • Keratinocytes: 90% of epidermal cells, 4 – 5 layers, produces keratin (rough fibrous protein that protects skin), waterproofs skin. • Melanocytes: 8% of epidermal cells, produce the pigment melanin, transfer melanin to kertinocytes, susceptible to UV light damage. • Langerhanscells: Produce immune response against pathogens entering skin. • Merkelcells: Detect touch/sensory sensations.

  5. Dermis • Consists of two distinct regions: • The superficial part is composed of areolar connective tissue. • The deeper partis composed of dense irregular connective tissue. • Attaches to the subcutaneous layer. • The outer layer contains nerve endings for touch, thermal sensations, pain, tickling, and itching.

  6. Skin Color • Skin color is due to the melaninin the epidermis, carotene in the dermis, and hemoglobin in the capillaries of the dermis. • Melanin (Brown-Black pigment) • Darkness depends on amount of melanin produced. • Gives some protection against UV • Malignant melanoma, (cancer of the melanocytes), is a particularly serious skin cancer. Liver or age spots, are non-cancerous clusters of melanin. • Carotene (Yellow-Orange pigment) • In deeper skin and adipose layers • Hemoglobin (Pink-Red pigment) • Found in blood • Depends on blood flow

  7. Review • What are the 5 functions of skin? • What are the two main parts of skin called? • What 4 cells make up the superficial/thinner part of the skin? • What is the function of the subcutaneous layer? • Which skin layer contains nerve endings? • What pigments contribute to skin color? • The shade of your skin depends on what factor? • What are the characteristics and functions of keratinocytes?

More Related