Question

What are the two examples of exocytosis in the human body?

Answer 1

The process by which the cell expels the substances such as waste materials, foreign unknown particles, ions, etc. is known as exocytosis. The cell expels these substances into the extracellular fluid.

Complete answer:
There is 5 main process of exocytosis:
Vesicle trafficking: This step involves the transportation of vesicles to a small distance. This vesicle consists of the substances that are required to be disposed of.
Vesicle tethering: When the vesicle is transported to the target area, vesicle tethering begins. This step links the vesicle to the cell membrane by certain proteins. This step is useful for stable packaging interactions. It links the vesicle to the cell membrane at half the diameter of the vesicle.
Vesicle docking: this step involves the fusion of the cell membrane and vesicle at the porosome forming a complex.
Vesicle priming: this step occurs after the initial docking of the vesicle. It involves molecular rearrangements and protein and lipid modification after the docking.
Vesicle fusion: This is the last step of exocytosis that involves the fusion of the vesicle membrane with the targeted membrane. It results in the expulsion of the substances out of the cell.
Secretion of enzymes, hormones, and antibodies from different cells and the flipping of plasma membranes are examples of exocytosis in the human body.

Note:
Another process is known as endocytosis also occurs in the human body. Contrary to exocytosis, endocytosis is a process in which substances such as proteins, enzymes, minerals, nutrients, ions, etc. are brought into the cell. Endocytosis includes cellular processes such as pinocytosis and phagocytosis.