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Human Biology Chapter 3

Human Biology Chapter 3. Section 3: The Integumentary System. The Integumentary System . The integumentary system is the organ system made up of the many different layers of cells that protect you from your outside environments The integumentary system includes: Your skin Your hair

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Human Biology Chapter 3

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  1. Human Biology Chapter 3 Section 3: The Integumentary System

  2. The Integumentary System • The integumentary system is the organ system made up of the many different layers of cells that protect you from your outside environments • The integumentary system includes: • Your skin • Your hair • Your finger and toe nails

  3. Importance of the Skin • Your skin is the largest organ you have and it performs several important functions: • Repels water • Guards against infection • Helps maintain homoeostasis • Allows us to sense our environment

  4. Skin is Complex

  5. Layers of the Skin: Epidermis • The epidermis is the outer layer of your skin that you can see • The epidermis contains many protein fibers that give skin its tough protective quality. • Epidermis cell are formed in the lower layer of the skin and slowly move to the top to replace old cells.

  6. Layers of the Skin: Dermis • The dermis is the inner layer of skin made up of elastic cells which allows your skin to flex and change shape as you move. • The dermis contains blood vessel which supply the skin with oxygen and nutrients.

  7. Parts of the Dermis: Sweat Glands • Sweat glands are found all over the body which release sweat through pores, or openings, on the skin’s surface. • When we become too warm we sweat to cool off, when water is released it quickly evaporates taking heat with it cooling the body.

  8. Parts of the Dermis: Oil Glands • Oil glands produce oils which moisten your skin and hair to keep them form drying out. • The oil released also help to water-proof your skin . • The pores that release the oil (along with bacteria) are responsible for causing pimples and black heads if they get clogged.

  9. Parts of the Dermis: Hair and Nails • Your hair and nail are both made of dead cells but both continue to help your body. • Hair on your head protects your scalp from the sun and keeps your head warm in cool weather; body hair does the same thing but to a lessor degree. • Your nails simply protect your tender finger and nail beds.

  10. Parts of the Dermis: Sensory Receptors • Although sensory receptors are part of the nervous system they are located in the dermis. • The receptors detect heat, cold, pain, touch, and pressure. • Sensory receptors are made to protect the body: if you feel pain you pull away.

  11. Skin Growth • As you grow your skin must grow with you. • Skin growth occurs in the dermis where your new cells divide to replace the old cells. • Every 2 – 4 weeks your epidermis is completely new.

  12. Healing • When your skin comes in contact with the outside world injury can occur, if the injury is a minor cut, scrape, or burn your skin can repair it self in a few days. • However several heat, cold, or major lacerations are more difficult to heal and can require medical attention.

  13. Skin Care • Your skin is just like any other part of your body and needs to be taken care of. • You must eat properly and clean it regularly. • In addition other protections may be needed such as sun block .

  14. The End!!

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