1 / 11

Integumentary system 36-3

Integumentary system 36-3. Components. Skin, hair, nails, and glands The body’s covering Separates us from the outside world. Skin function. Protection : barrier against infection and injury Temperature regulation Removes waste products Protects against UV radiation from the sun.

minh
Download Presentation

Integumentary system 36-3

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. Integumentary system 36-3

  2. Components • Skin, hair, nails, and glands • The body’s covering • Separates us from the outside world

  3. Skin function • Protection: barrier against infection and injury • Temperature regulation • Removes waste products • Protects againstUV radiation from the sun

  4. Epidermis • Outer layer of skin • Dead cells form the waterproof, flexible outside layer • Living cells move upward to replace them • Melanin: brown pigment that absorbs UV skin

  5. Dermis • Has blood cells, nerve fibers • Oil glands keep skin flexible, waterproof • Helps regulate body temp: • Too cold, hairs stand up, blood vessels narrow. • Too hot: sweating cools, removes wastes • Blood vessels expand to cool blood

  6. Glands of the dermis: sweat glands • Sweat glands: produce perspiration (water + salts). When the sweat evaporates, it takes heat away from the body. • Sweat also removes wastes from the blood. • We produce, on average, 500ml of sweat a day. • Doing strenuous work or with heat exposure, we can produce10 liters of sweat a day!

  7. Sebaceous glands • Oil glands produce sebum: an oily secretion, onto the outer layer of skin. • Sebum keeps the epidermis flexible and waterproof. • Over-production of sebum leads to acne.

  8. Skin cancer • Abnormal skin growth, caused by too much UV exposure • Prevention: sunscreen, hats, clothing. Basal, squamous, melanoma cancers

  9. Hair • Keratin: makes hair (also horns, scales, quills and feathers). Is not living tissue. • Scalp hair: warmth, UV protection • Nose, eyelash, ear hairs: prevents dirt from entering • Follicles: living cells at the base push the hair outwards.

  10. Nails • Cover and protect fingers and toes • Cells of the nail root fill with keratin to make the tough, platelike nail • Grow 3mm-12mm a month

  11. Review questions • What are the main functions of skin? • What part of the hair is living? What part of the hair is dead cells? • Why is it important that skin be waterproof? • Why don’t you bleed if you get a light scratch? • What can we do to keep our skin healthy?

More Related