Invertebrate Locomotion
- Created by: daisygbates
- Created on: 21-05-17 17:46
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Invert Locomotion
Principles of Locomotion
- Newton's Laws of Motion
- When at rest, a body can be set in motion by the application of an external force
- A body moving in a straight line will continue to do so unless cted upon by an external force
- The appication of an unbalanced force to a body results in an acceleration/decceleration of the mass in the direction of the force
- For every action there must be an equal and opposite reaction
Reynolds Number (Re)
- The relationship between the size of the body, its velocity and the viscosity of the medium is expressed as the reynold's number
- When small, inertia and turbulence are non-existent
- When large, viscosity of the medium becomes less significant
- Movement when small = very energetically expensive
Locomotory patterns
- Passive Transport
- Swimming
- Walking
- Running
- Jumping
- Flying
Passive Locomotion
- Organism is carried by water/air currents
- Exhibited by wide range of organisms
- Typically small (Low Re)
- Need to acheive neutral buoyancy
- Several ways of acheiving this
- Increased water content
- Removal of heavy ions
- Reduction of heavy shells
- Increased lipids/fats
- Gas filled bladders
- Increased surface area:volume ratio (SA:V)
- Several ways of acheiving this
Ciliary Locomotion
- Common in inverts
- Restricted to smaller invertebrates + larvae (<10^3 µm length)
- Also used to generate feeding currents
- 9+2 arrangement of microtubules
- Two aspects to the movement: power + recovery
- Metachronal rythmicity
Larger invert locomotion
- To move, animal…
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