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Overshoots

overshoot

1. Generally, any initial change, in response to a sudden step change in some factor, that is greater than the steady-state response to the new level of that factor; common in systems in which inertia or a time lag in negative feedback outweighs any damping that may be present. Changes in a negative direction are sometimes distinguished by the term undershoot, and the two may alternate in an oscillatory fashion, as in the transient oscillations of a pendulum when released from an initial displacement.

2. Momentary reversal of the membrane potential of a cell (inside becoming positive rather than negative relative to the outside) during an action potential; considered a form of overshoot because, before discovery of overshoot, excitation was thought merely to depolarise the membrane to zero transmembrane potential.


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dizzines

... your BP recovers and you don't pass out every time you stand up. It is a neat little process: Stand up, BP drops, HR increases slightly, BP then overshoots a little, HR adjusts to accomodate the overshoot, then there is a little ripple dance between the two as they balance out to normal operational ...

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by ERS
Mon Jan 23, 2006 12:45 am
 
Forum: Human Biology
Topic: dizzines
Replies: 7
Views: 4467


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