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1. Figure TB-4.1 is a "generic" level 0 data flow diagram (DFD), taken from Figure 4.5 in the text.
Required:
Using good data flow diagram construction techniques draw a diagram to explode bubble 3.0 to its next lower level. Diagram 3.0 should contain three processes, appropriately numbered, and should contain the following data flows in addition to those in the level 0 diagram (see NOTE):
a. Flow H runs from the first process to the second.
b. Flow I runs from the first process to the third.
c. Flows J and K run from the second process to the third.
NOTE: Assume that the flows shown in the level 0 diagram affect diagram 3.0 as follows:
1. Flow D runs to the first process in diagram 3.0.
2. Flow B runs from the third process in diagram 3.0.
3. The data flow running from the data store runs to the second process in diagram 3.0.
Neurotransmitter
Chemical messengers that transmit signals across a chemical synapse, from one neuron to another target neuron.
Cardiac Muscle
A specialized form of striated muscle found in the walls of the heart, responsible for pumping blood throughout the body.
Atrial
Pertaining to the atria, the two upper chambers of the heart that receive blood entering the heart.
Ventricular Contractions
The tightening of the heart's ventricles that occurs during the heartbeat to pump blood out of the ventricles to the rest of the body.
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