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Rules of organic Regulation

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This means that the defining equations are of identical form, and two systems can be shown to be analogous only by establishing this fact. The above definition of analog is somewhat restrictive, compared to those found in much of the current literature. However, the analogous relation thus becomes precise, and so it is in this sense that the term will be used here. It should also be noted that an analog is not unique, in the sense that a given fluid flow analog may represent many different physical systems.

The block diagram in (c) provides another way of representing this system in which not only flows but any other physical quantity may serve as the input and output variables. The relations between the variables may be given in either graphical or algebraic form (Riggs, 1970). d. From the standpoint of the whole organism, only β ι and Q6 may be of interest, and the additional flows in the second compartment may appear as constants or parameters in the overall relation. Thus, a term dependent upon Q3 appears in the expression for Q5, but Q4 is buried in the constant K2.

To maintain a fixed gaze at, say, an angle Θ from the primary position, the sum of all torques acting on the globe must equal zero, and this in turn requires a precise balance in the muscle actions. To achieve this balance, feedback signals from the visual fibers and muscle proprioceptors are required. This feedback is not shown explicitly, but only as providing an additional input to the motor neurons. c. The group of motor neurons which send signals to one muscle, termed the motor neuron pool, is represented by one block.

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