1. Ukubonelela ngokwezifiso, ukusebenza kakuhle
2. Ulusu olunobuhlobo kunye nokuphefumula, i-cartilage ayiqengqeleki emphethweni
3. I-elastiki ethambileyo ephefumlayo, iqinile kodwa ayikrwitshiweyo
4. Isisu esikhululekileyo, asiphumanga kwindawo kwaye asikho nesiphene