What is the sarcolemma?
plasma membrane of a muscle cell
The sarcolemma is the specialized cell membrane that surrounds muscle fibers or muscle cells. It is a thin membrane that encases the cytoplasm of a muscle cell and acts as a boundary between the extracellular fluid and the intracellular environment. The sarcolemma plays a crucial role in muscle contraction by conducting electrical impulses (action potentials) from the nervous system into the muscle fiber, which in turn activates the contractile machinery inside the cell. It also helps to regulate the exchange of molecules such as ions, nutrients, and waste products between the cell and its external environment. Additionally, the sarcolemma contains receptors that interact with various hormones and signaling molecules to help regulate muscle growth, repair, and metabolism.
More Answers:
Sarcomere: The Basic Unit of Muscle ContractionSarcomere: The Smallest Unit of Muscle Contraction Explained
The 5 Crucial Functions of Muscles: From Movement to Protection of Internal Organs