The HeadBelow is the subsystem that solves the equations for the head. It is identical to the subsystems for the arms, legs, and trunk except for the parameters used.
Figure 1. Simulink block diagram of the head.
Physiological notes:Simulation notes:
- The circulatory system in the head can be affected by external heat sources (such as a hard working brain!) through the variable fe, although for the basic model, such sources are ignored (fe = 0).
- Ambient temperature is included with the ta term, and its effect is proportional to the head's area, A, and a thermal constant, K.
- Note that in the current model blood flow effects heat flow, but heat flow does not effect blood flow.
- The Goto and From blocks F6i and P9 are connections to other circulatory systems where the information flow is opposite of blood flow. Using the Goto and From blocks for these connections allows the connections to be made "below the surface", thereby keeping the main block diagram (physbe) uncluttered and less confusing.
- The Goto blocks, P6i, V6, and P6 output information to be passed directly to the Analysis Subsystem, where it can be managed in one central location.
- The line labels are used to keep track of variable information, making the flow of information easier to track.
