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The Integumentary System
Transcript of The Integumentary System
The Skin: More than Just a "Coat"
- your skin, hair, and nails make up this system. It means "covering".
Functions of our skin:
- protection by keeping moisture in and keeping foreign particles out.
- nerve ending in your skin give you the sense of touch.
- regulates body temperature.
give off liquid that takes heat away as it evaporates.
gets rid of wastes. Many chemicals can be released through sweat.
What Determines Skin Color?
A darkening chemical in skin called melanin determines skin color. More
makes skin darker while less melanin makes skin lighter.
in the surface layers of skin helps protect against radiation from the sun that causes skin cancer.
A Tale of Two Layers
Epidermis - the thinner outer layer of skin that mostly consists of dead skin cells. This is tough protective skin.
Dermis - the deeper thicker layer that is made of all living tissue. All the different structures in skin are contained in the dermis. It is mostly made of connective tissue that makes skin pliable.
Hair and Nails
- a tiny sac at the bottom of a hair where new cells are added to the hair pushing the older cells upward. The follicle is the only living part of a hair.
Functions of hair:
- protection - hair protect our skin, eyes, and nose from particles, UV light, and insects.
- regulate body temperature - each hair has a muscle connected to it that when contracted makes the hair stand up so that the body hairs can insulate (hold in air) better.
Functions of nails:
- nails protect your finger tips and toe tips so they can remain soft and sensitive to touch.
Living in Harms Way
The skin has an amazing ability to repair itself from blisters, cuts, and insect bites.