Secretory vesicles (destined for exocytosis) that fuse with the plasma membrane continuously, with no requirement for hormones or any other environmental signal, are properly referred to as: the v-SNARES constitutive secretory vesicles (like those that carry lipids, such as phosphatidylcholine) the endosomes regulated secretory vesicles (like those that carry hormones, such as insulin) the t-SNARES
Structure and Composition of Cell Membrane
Despite differences in structure and function, all living cells in multicellular organisms are surrounded by a cell membrane. Just like the outer layer of the skin separates the body from its environment similarly, the cell membrane, also known as 'plasma membrane,' separates the inner content from its exterior environment.
Cell Membrane
The cell membrane is known by different names like plasma membrane or cytoplasmic membrane, or biological membrane. The term "cell membrane" was first introduced by C. Nageli and C. Cramer in the year 1855. Later on, in 1931, the term "plasmalemma" for cell membrane was given by J. Plowe. The cell membrane separates the cell's internal environment from the extracellular space. This separation allows the protection of cells from their environment.
Prokaryotes vs Eukaryotes
The cell is defined as the basic structural and functional unit of life. The cell membrane bounds it. It is capable of independent existence.
Secretory vesicles (destined for exocytosis) that fuse with the plasma membrane continuously, with no requirement for hormones or any other environmental signal, are properly referred to as:
- the v-SNARES
- constitutive secretory vesicles (like those that carry lipids, such as phosphatidylcholine)
- the endosomes
- regulated secretory vesicles (like those that carry hormones, such as insulin)
- the t-SNARES
Secretory vesicles are tiny little packages that contain certain cell secretions that can be transported. The vesicles are membrane-bound and produced by the Golgi apparatus or endoplasmic reticulum. Most vesicles will have specialized functions and specific materials that they transport.
Step by step
Solved in 2 steps
