### line | great circle:

Meridian
* All meridians are halves of great circles
  - of equal length
  - meet and form a point at the poles
  - start or finish in the head, chest, hands or feet
* Any meridians passing through the United States are degrees of West longitude.
* Most meridians bear the name of the organ related to it.
* are also loci of strip like magnetic fluxes ortogonal to the skin.
* are great circles that pass through the poles
  - imaginary circles that run through both poles
  - important for setting time zones
* are like rivers flowing through the body to nourish tissues
  - of energy that all connect throughout the body
  - perpendicular to every latitude
  - separatrices
  - the farthest apart at the equator
* are the main lines of longitude on maps
  - trunks of the body and run longitudinally within the body
* are the pathways where bioelectons move more frequently than other parts of the body
  - bioelectrons move more frequently than any other part of the body
  - true north base lines
* converge at the poles.
* exist at every level of the body.
* express degrees of longitude , or how far a place is away from the prime meridian.
* function something like rivers made of energy.
* run north to south from pole to pole.

### line | great circle | meridian:

Magnetic meridian
* are in black, geographic meridians and parallels are in blue.
* line of longitude

Vertical circle
* receive their name from the fact that they are perpendicular to the horizon.
* rise perpendicular to the horizon.

Hemline
* are also of varying lengths, from the mini-skirt to ankle length
  - fashion
* are part of coats
  - dresses
  - skirts

Horizontal line
* are an event in time
  - contours of constant potential temperature
  - lines that follow the horizon, from left to right or side to side
  - shorter than vertical groups
  - thicker than vertical ones
* is used as an equilibrium level.
* measure time.
* represent typical paths of integration along lines.

Intravenous line
* give fluid, blood, and medications as needed.
* require perforation of the skin and a vein, in other words mechanical injury.

Isometric
* are exercises where the muscles are simply tightened but no movement occurs
  - muscle contraction
* can improve muscle strength.

### line | isometric:

Contour line
* are a means of representing vertical relief of flat paper
  - way of representing height and structure on a flat map
  - always parallel
  - an important part of the styles of comics and cartoons
  - isolines showing elevation
  - the simplest and most familiar to most people
* can show depths.
* connect points of equal elevation.
* depict the elevation and shape of terrain.
* form a V pattern when crossing streams, with the apex of the V pointing upstream.
* go in pairs up valleys and sides of ridges.
* indicate the depth of sand and gravel deposits.
* is an isometric
* join points of equal elevation above a specified reference, such as sea level.
* represent common landscape elevations above sea level
  - constant elevation
  - the atmospheric pressure in another form
* run through points of equal depth.
* show the elevation and shape of terrain.
* trace areas of equal height and they are drawn at regular elevation intervals.

Isometric training
* can provide relatively quick overloading and strengthening of muscles.
* is most beneficial in sports where static contractions are performed regularly.

### line | isopleth:

Isobar
* Is a process taking place under constant pressure.
* name used for isolines showing magnetic declination.