### device | mechanism:

Physiological mechanism
* Most physiological mechanisms have limits
  - involve in effects
  - play roles
* Some physiological mechanisms mediate behavioral responses
  - regulate pressure

### device | mechanism:

Piston
* Most pistons pump air
  - turn wheels
* Some pistons have chambers
  - combustion chambers
* are mechanical devices.
* are part of car engines
  - cars
  - reciprocating engines
* can change from round to oval due to stress and temperature.
* do jobs.
* includes piston rings
  - rods
  - sections
* perform several functions.
* push air and gasses on both ends of the cylinder.
* sometimes end up with holes in their tops from the high temperatures and high pressures.
* swell inside their cylinders and can scuff or seize.
* transmit the driving force of combustion to the crankshaft.

Pivot
* are axises
  - marchers
  - rotation
  - the skinny ends of the arbors that the gears are attached to
* includes sections.
* play an important role in irrigating crops for today farmers.

Poppet
* Some poppets are part of automobiles
  - go-karts
* includes sections.

### device | mechanism:

Propeller
* Most propellers are two, three, four, or five, bladed
  - spin generators
* Most propellers turn metal shafts
* Some propellers act as turbines.
* are mechanical devices
  - very sharp and can cut wet skin easily
* blades that strike snow banks can be easily bent and damaged beyond use.
* can chop off plant shoots and uproot whole plants if operated in shallow water.
* develop thrust by moving a large mass of air through a small change in velocity.
* having the same shape, but are scaled by a size factor behave similar.
* includes hubs
  - vanes
* make flight for humans comfortable and efficient.
* work just like a paddle.

Proximate mechanism
* deal with how a behavior is performed.
* produce behaviors that evolved because they increase fitness in some way.

Pulley
* are good for moving objects to hard to reach places
  - located in gyms
  - machines
  - motorcycle rims
  - tools
* serve a very important function in a robot.
+ Pulley, Types of pulleys: Mechanics :: Tools
  * Pulleys are useful in construction sites.

### device | mechanism:

Ramp
* are a spring ephemeral of deciduous forests in eastern North America
  - type of wild onion that grows in mountain areas of the South
  - located in state parks
  - ramps
  - simple machines
  - stairways
* come in many shapes, forms, weights, and lengths.
* correspond to moments in time where the turntable was momentarily slowed.
* have the ability to regulate the receptor activity in a dynamic manner.
* is an inclined plane
* reproduce by both bulb offsets and seeds, and large colonies can blanket a hillside
  - seeds, and large colonies often blanket a hillside
+ Controlled-access highway: Roads
  * These kinds of highways have four lanes or more. They carry many vehicles. They have no traffic-lights or ground level intersections. All roads crossing the highway go over a bridge or a tunnel. Ramps connect the highways to smaller roads and other highways. The place where highways meet these roads are called interchanges. Places where cars can leave or enter the motorway are called exits. Many freeways do not allow slower traffic, such as bicycles and pedestrians, to enter them.

Reaction mechanism
* Most reaction mechanisms have more than one step.
* are proposed to explain the kinetics and the relative product mix of a reaction.