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Intro to Physiology

Positive Feedback Output is continually enhanced so that the controlled variable continues to be moved in the direction of the initial change. The initial change is enforced.
Negative Feedback Change in a controlled variable triggers a response that opposes the change, driving the variable in the opposite direction of the initial change.
Feedforward control A response is generated in anticipation of a change in a controlled variable.
Closed loop changes The stimulus is directly effected by the response
Open loop changes The sensor is not directly effected by the response
Gain= Correction/Error This is a way of classifying the effectiveness of a control loop. It gives a normalized representation of the amount of controlled (correction) relative to uncontrolled (error)
Correction Change in variable that is brought about by the control system
Error Difference between the prior state and the perturbed state
Comparator Site where the stimulus is compared to the set-point and a physiological determination is generated to make an adjustment or not
Error signal Difference between the stimulus and the set point. The sign of difference is often more important in determining the response
Bulk flow Net displacement of a volume of a solvent, ans all of its solutes that are dissolved or suspended within it. (Major transport of water)
Hydrostatic pressure Force on a liquid due to compressive forces like gravity or beating of heart.
Osmotic pressure Due to the number of particles in solution.
What is the reflection coefficient if the molecule is impermeable? Permeable? 1 if impermeable and 0 if permeable