<P> Exocytosis ( / ˌɛksoʊsaɪˈtoʊsɪs / ) is a form of active transport in which a cell transports molecules ( e.g. , neurotransmitters and proteins ) out of the cell ( exo - + cytosis ) by expelling them through an energy - dependent process . Exocytosis and its counterpart , endocytosis , are used by all cells because most chemical substances important to them are large polar molecules that can not pass through the hydrophobic portion of the cell membrane by passive means . </P>
<P> Exocytosis ( / ˌɛksoʊsaɪˈtoʊsɪs / ) is a form of active transport in which a cell transports molecules ( e.g. , neurotransmitters and proteins ) out of the cell ( exo - + cytosis ) by expelling them through an energy - dependent process . Exocytosis and its counterpart , endocytosis , are used by all cells because most chemical substances important to them are large polar molecules that can not pass through the hydrophobic portion of the cell membrane by passive means . </P>
packages protein for transport out of the cell
packages protein for transport out of the cell
Exocytosis
Exocytosis