Cellophane and bellows: what they have in common

1. Step 1. Cellophane — is material for — Haemodialysis machine. Kolff’s membrane was a cellophane tube.
2. Step 2. Haemodialysis machine — has part — Centrifugal pump. A blood pump (peristaltic).
3. Step 3. Centrifugal pump — is part of — Central heating. A circulation pump.
4. Step 4. Central heating — has part — Valve. Valves on the radiators set how much hot water flows into a room.
5. Step 5. Valve — is part of — Bellows. A valve in the bellows lets air in when they open and keeps it from escaping back.

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