### structure:

Wall
* Many walls curve around edges or slope from the ceiling to floor.
* Most walls act as barriers.
* Most walls are enclosed by elastic membranes
  - consist of cell layers
* Most walls consist of longitudinal layers
  - muscle layers
  - mucous membranes
* Most walls consist of outer cell layers
  - polysaccharides
* Most walls contain layers
  - muscular layers
  - outer layers
  - go down thousands of feet
* Most walls have cell layers
  - dimensions
  - insulation
  - surface areas
  - surfaces
* Some walls absorb nutrients
  - water
  - are made of polysaccharides
  - break bones
* Some walls contain blood vessels
  - muscle fiber
  - salivary glands
  - small blood vessels
* Some walls cover cell membranes
* Some walls have average thermal conductivity
  - elastic fiber
  - longitudinal muscles
  - outer ectoderms
  - smooth muscles
  - hold cytoplasm
  - prevent air
* always receive some reflected shortwave radiation from their surroundings.
* appear morphologically to be due to unaltered, random packing of plasma and skeleton grains.
* are a natural part of human life
  - passive defence system designed to stop enemy infantry and vehicles
  - albums
  - an essential element in the design of interior spaces
  - boundaries
  - capable of separate rooms
  - data sources that keep track of particle collisions during each time step
  - difficulty
  - extremely vulnerable to heat infiltration on warm, sunny days
  - fences
* are located in buildings
  - classrooms
  - corners
  - houses
  - labyrinths
  - prisons
  - objects
* are part of buildings
  - caves
  - hallways
  - structures
  - partitions
  - sites
  - stratums
  - things to run across and bounce off of and floors are things only humans walk on
  - used for privacies
  - verticals
  - where most energy is lost
* collect debris.
  - distinct layers
  - logs
  - substances
* contain outer layers
  - signaling molecules that participate in cell cell and wall nucleus communication
* do more than just hold up roofs.
* have advantage
  - complex structures
  - ears
  - eyes
  - fiberglass insulation
  - fine structures
  - purposes
* includes bases
  - doorsteps
  - readsides
  - sections
* meet floors.
* prevent damage.
* protect areas.
* provide excellent protection
* support load.
* usually grow and shrink and new walls can evolve.

### structure | wall:

Archaeal wall
* All archaeal walls are resistant to lysozyme.
* differ widely, and are made from different materials.

Arterial wall
* deteriorates until it is weakened sufficiently to produce a bulging appearance.
* expand and contract with each heartbeat, pumping blood throughout the body.

Artery wall
* become thick and lose their ability to stretch
  - thicker and lose their elasticity, allowing plaque to collect
* have muscles that help to maintain blood pressure and pump blood through the body.

Double wall
* are used to insulate many things, including refrigerators and coolers.
* work well as insulation because air is trapped between the walls.

Eye wall
* are called as such because oftentimes the eye is surrounded by a vertical wall of clouds.
* is the wall of highest tops encircling the eye.
* wall of clouds and intense thunderstorms that surround the eye.