Vesikulë

Vesikulë is a term used in biology to refer to a small, membrane-bound sac within a cell. These sacs are essential for various cellular functions, primarily related to transport and storage. Vesicles are formed from the cell membrane or internal cellular membranes and can contain a wide range of substances, including proteins, lipids, and other molecules.

The formation and movement of vesicles are critical for processes such as endocytosis, where the cell engulfs external material, and exocytosis, where the cell releases substances to the outside. They play a vital role in the secretion of hormones and neurotransmitters, the transport of nutrients, and the removal of waste products. Vesicles are also involved in the intracellular trafficking of molecules, ensuring they reach their correct destinations within the cell.

Different types of vesicles exist, each specialized for particular tasks. For example, transport vesicles move materials between organelles, while secretory vesicles store substances destined for release from the cell. Lysosomes, which contain digestive enzymes, are a type of vesicle involved in breaking down waste materials and cellular debris. The dynamic nature of vesicle formation and fusion is a fundamental aspect of cellular organization and communication.