### covering | skin:

Permeable skin
* Most permeable skin absorbs chemicals
  - harmful chemicals
  - toxic chemicals
* Some permeable skin takes in oxygen.
  - substances
* offers protection.

Reptile skin
* Most reptile skin has glands.
* Some reptile skin has keratin.

Scalp
* Every scalp has dandruff, which is comprised of waste matter excreted by the scalp.
* are films
  - part of human heads
  - solid objects
  - the medium of exchange and human life the guarantor of the bill
* burns in elderly women - the perils of the perm.
* flaps in the treatment of baldness.
* is skin
* scarring as a result of burns, other types of injuries, or infections occurs infrequently.

### covering | skin | scalp:

Itchy scalp
* is the signal for a lice inspection.
* year-round problem, but intensifies with environmental and emotional stress.

Scaly skin
* Most scaly skin contains keratin
  - protein keratin
* prevents dehydration.

Sheep skin
* Some sheep skin has structures.
* are naturally sanitary and are often used to cushion the strollers or cribs of infants.
* provides, among other things, warm coverings for the sometimes-chill desert nights.

Skin change
* are a common sign of chronic arsenic exposure
  - short-term effects of radiation
* associated with fungal infections often are quite specific.

Skin graft
* are necessary when the injury or swelling prevents the skin edges from closing.
* can be autografts or allografts.
* involve replacing or attaching skin to a part of the body that is missing skin.
+ Autotransplantation: Surgery :: Tissues
  * Autotransplantation' is  transplanting tissues from one part of the body to another part of the same person. Skin grafts are a common example.

Skin grafting
* common technique performed to restore an affected area of skin.
* is used to replace skin cover
  - when it is the best way of closing a wound or defect

Thick skin
* Most thick skin protects eyes.
* Some thick skin is protected by bony plates
* covers layers.
* prevents loss of moisture.
* provides protection.

Thin skin
* Most thin skin absorbs gases.
* Some thin skin absorbs pesticide
  - has gases
* has appearances
  - fewer layers of living and dead cells but same structure
* is usually more sensitive than thick skin.

Yellow skin
* Most yellow skin retains color.
* can indicate jaundice and blue skin can indicate heart problems.

Young skin
* has more fat cells in the dermis than older skin.
* is especially vulnerable to sun damage
  - even more susceptible to sun damage than older skin
* suffers often from excess sebum secretion and large pores.

### covering | wear:

Corrosive wear
* involves both chemical activity and mechanical action.
* is largely the result of acidic blowby products formed during fuel combustion.

Uneven wear
* is caused by improperly balanced tires, or misaligned or broken suspensions.
* reduces the useful life of a tire.

Wearable
* Some wearables contain sensors that include wireless technology, cameras, or microphones.
* are clothing items used for promotion and event marketing and are often resold.
* come in many other forms.

Window covering
* are devices
  - magnets for dust
* attract dust.
* can stop drafts and reduce heat lost through window glass.
* reduce heat loss in winter and heat gain in summer.