1. Bell Work: 12/3/14 Using the Human Body Quest Bell Work packet, complete the questions for integumentary ONLY! Use the page numbers provided. You are being timed! You only get 10 minutes to complete bell work! Also work on: Skeletal & Muscular System drawings BW bonus questions

2. Objectives Can I explain the basic functions of a major organ system. (SPI0707.1.3) 38. Integumentary System (one page)

3. Integumentary (pg. 218-221) Your skin, hair, and nails make up your integumentary system. Functions of skin: 1.Protects by keeping water in and foreign particles out. 2.Nerve endings let you feel things around you. 3.Helps you regulate your body temperature. 4.Helps get rid of wastes, which can be removed in sweat.

4. Integumentary System (218-221) Layers of Skin: 1.Epidermis- the outermost layer of skin. Most cells in the epidermis are dead. 2.Dermis- the thick layer of skin below the epidermis.

5. Integumentary System (218-221) Hair and nails are made of living and dead cells. A hair forms at the bottom of a tiny sac called a hair follicle. The only living cells in a hair are in the hair follicle. Question: –Why doesn’t it hurt when we get our hair cut? Why does it hurt when someone pulls our hair? Hair helps protect skin from ultraviolet light and keeps particles, such as dust, out of our eyes and nose. Nails protect the tips of your fingers and toes.

6. HairHair and NailsNails A hair is made up of layers of dead, tightly packed, keratin- filled cells. In nails, new cells are produced in the nail root, just beneath the lunula. The new cells push older cells toward the outer edge of the nail.

7. Drawings For each body system, draw and color at least one organ that belongs in that body system. For example: –Integumentary = color skin, draw hair and nails, diagram of the skin Use your textbook pictures or the sample sheet in the folder at your group.

8. Human Body Books

9. Interesting Facts Integumentary System: As sweat evaporates, the skin cools. Skin color is determined by a chemical called melanin. If a lot of melanin is present, skin is very dark. If little melanin is present, skin is very light. The dead cells in the skin, hair, and nails is filled with a protein called keratin. The skin is the largest organ of the body, covering an area of about 2 m²! Chill bumps: a tiny muscle attached to the hair follicle contracts. If the follicle contains a hair, the hair stands up. The lifted hair works like a sweater. They trap warm air around the body. Acne: hormones that cause oil glands in the skin to make too much oil combine with dead skin cells and bacteria to clog hair follicles. The result is acne.