Personal computer and piston pump: what they have in common

1. Step 1. Personal computer — has part — Microprocessor. The PC became possible thanks to the microprocessor.
2. Step 2. Microprocessor — is part of — Insulin pump. A dosing controller.
3. Step 3. Insulin pump — has part — Piston. The reservoir’s plunger.
4. Step 4. Piston — is part of — Piston pump. The piston draws in and pushes out liquid.

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