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    The definition for endocytosis in my textbook is:
    bulk movement of large molecules and particles into cells.

    What does bulk mean in this context?

    In large amounts?

    So you have Exocytosis which is the movement of molecules from the inside of the cell out ( in ACH synapse the neurotransmitter is passed out from the presynaptic membrane to the synaptic cleft by exocytosis)

    Endo is the movement in, such that transcriptional factors which are lipid soluble diffuse into the cell thru the phospholipid bylayer, and stimulate transcription.

    I don;t think bulk really matters in a biological context unless its specific to a biological process


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