Tube connector and refrigerator: what they have in common

1. Step 1. Tube connector — is part of — Catheter. Connection to the bag.
2. Step 2. Catheter — is part of — IV drip. A catheter.
3. Step 3. IV drip — has part — Syringe. A needle.
4. Step 4. Syringe — is used in — Vaccine. Injections.
5. Step 5. Vaccine — uses — Cold chain. Cold storage.
6. Step 6. Cold chain — uses — Refrigerator. Refrigerators.

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