### substance:

Body fluid
* All body fluids are water based.
* Many body fluids can mix outside the body and re-enter it during the intense activity of childbirth.
* Most body fluid fills cavities.
* Some body fluid bathes internal organs.
* Some body fluid causes death
  - pain
  - contains seawater
  - produces urine
* are acid, and painful or diseased areas are alkaline
  - alkaline and painful or diseased areas are acid
  - examples for complex liquid solutions, containing many solutes
  - highly contagious
  - isotonic with the sea
  - water based solutions
* carry both useful and harmful substances.
* consist of blood, urine, feces, vomit, saliva, etc
  - water and minerals known as electrolytes
* dissolves salt.
* enters the nephridium via an internal opening called the nephridiostome.
* fills body cavities
* flow freely like rain on parched desert sands.
* have low number of free viruses - even the blood.
* help to lubricate the joints and cushion organs
  - maintain skin temperature in cold weather
* influences salt gland secretion
* interferes with exchanges
  - gas exchanges
* pass back into the body, nitrogenous wastes empty into the insect's gut.
* promotes diffusion.
* redistribute themselves toward the head.

Brown material
* are things like leaves, shredded paper and dried up plant cuttings.
* have a high carbon content, but little nitrogen.

Capsaicin
* are chemical compounds.
* blocks pain impulses.
* burns at first, but eventually deadens the pain sensors in the mouth
  - hands and eyes just as it creates a hot sensation when eaten
* causes a burning feeling when it is first used.
* gives peppers their hotness.
* is available as a cream or a gel
  - worth considering for the chronic pain of lupus
* targets pain receptors in the mouth.
* triggers the hair follicles and scalp by creating a tingling sensation.

### substance | capsaicin:

Pure capsaicin
* hydrophobic , colorless , odorless , crystalline to waxy compound.
+ Capsaicin: Chemical compounds :: Organic compounds :: Analgesics
  * It is responsible for the sense of 'hotness' found in chile peppers. In mammals, it causes a sensation of 'burning' of the tissues it comes in contact with. Pure capsaicin is a hydrophobic, colorless, odorless, crystalline to waxy compound.

Cardboard
* is located in boxs
  - cartons
  - packaging materials
  - recycling bins
  - warehouses
* prevents light.

### substance | cardboard:

Corrugated cardboard
* can also replace shiny gift bags for wrapping wine.
* common packing material that many businesses accumulate as waste.
* consists of two layers of heavy cardboard with a ribbed section in between.
* is cardboard
  - processed by a recycler
  - recycled into new cardboard and cereal boxes
* is the most common building product packaging material
  - thicker type of cardboard and is recyclable on campus
  - used mostly to manufacture cardboard boxes
* makes up a large portion of the retail trade's garbage.
* provides resting areas that earwigs find attractive.

Paperboard
* Most paperboard used for cleaning product containers is made from recycled paper.
* are cardboard.
* containing recovered fiber multi-ply material, formed in layers of recovered fiber.
* is an ideal substitute for plywood, hardwood and particle board in many applications
  - thicker than paper but thinner than corrugated cardboard

Cementum
* anchors the periodontal ligament to the root of the tooth.
* are part of roots.
* attaches to the periodontal ligament, which anchors the tooth to the surrounding bone.
* contains chemicals that enhance re-attachment of periodontal ligament.
* resembles bone in that it contains cells within lacunae in a mineralized matrix.