Catheter and car: what they have in common

1. Step 1. Catheter — is part of — IV drip. A catheter.
2. Step 2. IV drip — has part — Syringe. A needle.
3. Step 3. Syringe — has part — Piston. A plunger.
4. Step 4. Piston — is part of — Shock absorber. Inside, a piston moves in oil.
5. Step 5. Shock absorber — is part of — Car. Shock absorbers stop the body bouncing on a rough road.

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