Question

difference between endocytosis and exocytosis

Answer 1

Endocytosis:

The different types of endocytosis

Endocytosis is a form of bulk transport in which a cell transports molecules (such as proteins) into the cell (endo- + cytosis) by engulfing them in an energy-using process. Endocytosis and its counterpart, exocytosis, are used by all cells because most chemical substances important to them are large polar molecules that cannot pass through the hydrophobic plasma or cell membrane by passive means.

Neuron A (transmitting) to neuron B (receiving)

1. Mitochondrion

2. Synaptic vesicle with neurotransmitters

3. Autoreceptor

4. Synapse with neurotransmitter released (serotonin)

5. Postsynaptic receptors activated by neurotransmitter (induction of a postsynaptic potential)

6. Calcium channel

7. Exocytosis of a vesicle

8. Recaptured neurotransmitter

Exocytosis (/ˌɛksoʊsaɪˈtoʊsɪs/[1][2]) is a form of active transport and bulk 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 cannot pass through the hydrophobic portion of the cell membrane by passive means. It is a process of which the contents of a vacuole are released, since the plant cell has large amounts of content in its vacuole, when Exocytosis is in process a large amount of molecules are released thus making it a form of bulk transport.

In exocytosis, membrane-bound secretory vesicles are carried to the cell membrane, and their contents (i.e., water-soluble molecules) are secreted into the extracellular environment. This secretion is possible because the vesicle transiently fuses with the outer cell membrane. In the context of neurotransmission, neurotransmitters are typically released from synaptic vesicles into the synaptic cleft via exocytosis; however, neurotransmitters can also be released via reverse transport through membrane transport proteins.

Exocytosis:

Exocytosis is also a mechanism by which cells are able to insert membrane proteins (such as ion channels and cell surface receptors), lipids, and other components into the cell membrane. Vesicles containing these membrane components fully fuse with and become part of the outer cell membrane.

Answer 2

exocytosis transfer of molecules or distance from cell to outside through plasma .