Artificial heart valve and needle: what they have in common

1. Step 1. Artificial heart valve — has part — Check valve. It works as a check valve.
2. Step 2. Check valve — is part of — Piston pump. Check valves direct the flow.
3. Step 3. Piston pump — works like — Syringe. A syringe is a hand-operated piston pump.
4. Step 4. Syringe — has part — Needle. A hollow needle.

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