There's a bulb at the top of the pipette in the case of plastic and glass Pasteur pipette demands a rubber bulb for withdrawing liquid. A teat pipette is The mix of a glass pipette plus a rubber bulb. Drug Delivery: https://deweygedz617363.educationalimpactblog.com/49480991/the-smart-trick-of-types-of-pipette-that-no-one-is-discussing