### substance | fiber:

Optical fiber
* are also a huge part of making the Internet available around the world
  - extremely thin strands of glass, which are made up of many layers
  - hair-thin strands of glass that can guide light
  - just reflective tubes
  - lighter and thinner than copper wire
  - quite difficult to tap
  - simply strands of glass
  - thin strands of glass used for transmitting light signals used in communications
  - used to transmit communication signals
* are, therefore, suitable for use in the noisiest and most sensitive environments.
* bring light into cells on the gripping surface.
* can carry data much faster and more efficiently than electrical wires
  - handle tens of thousands of conversations simultaneously
* carry far more information than the old bundles of copper.
* consists of a thins strands of glass.
* enable networks of larger capacity and higher speed.
* extract the light and transmit it to electronics that convert it to electric signals.
* facilitates high speed, high quality, and high volume transmission of data.
* find new applications in data processing.
* guide the emitted light to a photodiode operated in current mode.
* has a number of advantages over the copper wire used to make connections electrically
  - vital size advantage over insulated electrical conductors
  - several advantages over copper media
* is also desirable because of it's electromagnetic immunity
  - digital
  - far more scalable than copper
  - high-capacity but low in cost and energy use
  - lightweight, flexible, and has become easy to handle and install
* is made from a silica fiber stretched thinner than human hair
  - of flexible glass and can support very high data transfer rates
  - more fragile than wire, difficult to split, and very labor-intensive to install
  - the alternative to copperwire used to carry signals for voice and data
  - very fast
* substitutes for copper in some telecommunications applications.
* supports greater distances than copper.
* transmit reflected light from the sensor to the detector.
* utilize light as a signal source, instead of electrical signals.
* wraps around the earth connecting people, business and governments.

Plastic fiber
* Most plastic fiber contains chemicals.
* is much less vulnerable than glass or silica fiber.

Preganglionic fiber
* can pass through the ganglionic trunk or connective.
* enter the inferior hypogastric plexus by way of the pelvic splanchnic nerves.

Raffia
* have fiber.
* is plant fibre

Reticular fiber
* are abundant below the basal lamina
  - also abundant in the smooth muscle of arteries, bone marrow, spleen, and liver
  - thinner and made mostly of type III collagen
  - very thin and highly branched
* form thick, ropelike structures.

Sensory fiber
* innervate the bladder to detect fullness, which are part of the micturition reflex.
* is fiber
  - fibre

Silk fiber
* are smooth and triangular when viewed in cross-section
  - used to make fabric and yarn
* are very strong
  - Silk' natural fiber made by the silk worm larvae. Silk is often used to make cloth. The cloth can be made into clothes, rugs, bedding, or can be used to write or paint on. Silk fibers are very strong. In the past, silk was used to make parachutes