||Endocytosis is a cellular mechanism where a cell internalizes substances from the external environment. These substances undergo certain processes of breaking down to smaller elements either for use by the cell or for elimination purposes.
||Exocytosis is a process that is used to transport materials from inside the cell to the external part of the cell by the use of energy. The mechanism uses special vesicles fille with the particles of interest to transport Generally, in this mechanism of exocytosis, a special vesicle bound to the cell membrane, containing the cellular particles will expel the cell content to the external part of the cell.
||There are three types based on the mechanisms of particle. They include:
||There are also 3 types depending on the sequence of processes involved in transporting particles out of the cell. They include:
|Phagocytosis; Pinocytosis; Receptor-mediated endocytosis (Clathrin-mediated endocytosis)
||Constructive; Exocytosis Regulated exocytosis; Lysosome mediated Exocytosis
||Being a form of active transport, they use some energy (ATP) during particle transportation.
||It is a type of active transport, using a lot of energy (ATP) for transporting particles out of the cell.
||Endocytic mechanisms are used to:
||Exocytosis is known for its functions in:
|Breakdown and eliminate microbial antigens using phagocytic cells
||Transportation of proteins and lipids use to repair the cell membrane after endocytosis
|Protozoans such as amoeba use phagocytosis to trap and digest nutrients (food)
||Transportation of glucagon and insulin hormones from the pancreas to the liver for breakdown and utilization by the body depending on body sugar levels.
|Uptake and absorption of nutrients through intestinal villi in the small intestines
||Transportation of chemical signals between cells allowing cell communication
|Transportation of iron-transferrins in receptor-mediated endocytosis
||It is also important in synaptic transmission of information in the neurons
|To absorb cholesterol that is bound to ‘bad cholesterol’ (Low-density lipoproteins) in receptor-mediated endocytosis