What is sarcolemma and Plasmalemma?
The sarcolemma is a specialized cell membrane which surrounds striated muscle fiber cells. Sometimes called the myolemma, the sarcolemma is similar to a typical plasma membrane but has specialized functions for the muscle cell.
What is the difference between sarcomere and sarcolemma?
sarcolemma: The cell membrane of a myocyte. sarcomere: The functional contractile unit of the myofibril of a striated muscle.
What is Sarcoplasm and sarcolemma?
Sarcoplasm is the cytoplasm of a muscle cell. It has a Golgi apparatus near the nucleus, mitochondria just inside the cell membrane (sarcolemma), and a smooth endoplasmic reticulum (specialized for muscle function and called the sarcoplasmic reticulum).
What is the difference between the sarcolemma and sarcoplasmic reticulum?
The sarcolemma is the plasma membrane that surrounds the muscle cell whereas, sarcoplasmic reticulum is the smooth endoplasmic reticulum of the muscle cell. This is the key difference between sarcolemma and sarcoplasmic reticulum.
Do all muscles have sarcolemma?
The sarcolemma generally maintains the same function in muscle cells as the plasma membrane does in other eukaryote cells. It acts as a barrier between the extracellular and intracellular compartments, defining the individual muscle fiber from its surroundings….
| Sarcolemma | |
|---|---|
| TH | H2.00.05.0.00003 |
| Anatomical terminology |
What is the sarcolemma of a muscle?
The sarcolemma is the plasma membrane of the muscle cell and is surrounded by basement membrane and endomysial connective tissue. The sarcolemma is an excitable membrane and shares many properties with the neuronal cell membrane.
What are 3 functions of the sarcolemma?
Sarcolemma. The sarcolemma or cell membrane is the site where calcium enters and leaves the cell through a distribution of ion channels, transporters, and pumps. The T-tubules are invaginations of the sarcolemma that form a permeability barrier between the cytosol and the extracellular space (Brette and Orchard, 2003).
How is sarcoplasm different from cytoplasm?
As nouns the difference between cytoplasm and sarcoplasm is that cytoplasm is (cytology) the contents of a cell except for the nucleus it includes cytosol, organelles, vesicles, and the cytoskeleton while sarcoplasm is (anatomy) the interfibrillar cytoplasm of striated muscle.
What is a sarcoplasm?
Sarcoplasm is the cytoplasm of a muscle fibre. It is a water solution containing ATP and phosphagens, as well as the enzymes and intermediate and product molecules involved in many metabolic reactions.
Is sarcolemma the same as Endomysium?
The key difference between endomysium and sarcolemma is that endomysium is a layer of connective tissue that surrounds a muscle cell while sarcolemma is the plasma membrane of a muscle cell..
What is the function of the sarcolemma?
The sarcolemma generally maintains the same function in muscle cells as the plasma membrane does in other eukaryote cells. It acts as a barrier between the extracellular and intracellular compartments, defining the individual muscle fiber from its surroundings.
Is sarcolemma the same as plasma membrane?
The sarcolemma anatomy can be defined as the plasma membrane of a muscle cell or the plasma membrane of a muscle fiber. Muscle cells are also known as muscle fibers due to their long, cylindrical shape.
How is the sarcolemma similar to a plasmalemma?
Each sarcolemma has a biochemical composition similar to that of a plasmalemma, which is another word for a cell membrane. The structure of muscle cells specifically is such that the tunnel-like extensions of the sarcolemma pass through the muscle cells from one side to the other, so they are said to be transverse.
What does sarcolemma stand for in muscle cells?
A. sarcolemma – plasmalemma of muscle cells. External to this cell membrane is a well developed basement membrane. B. sarcoplasm – cytoplasm of muscle cells excluding the myofibrils. C. sarcoplasmic reticulum – smooth endoplasmic reticulum of muscle cells.
How is the sarcolemma related to the basement membrane?
The sarcolemma is composed of collagen, glycocalyx (which contracts the basement membrane) and the plasmalemma. Because it is composed of the lipid bilayer, the sarcolemma also controls the type of molecules that enter the cell. For instance, due to the hydrophobic core of the lipid bilayer, the sarcolemma is impermeable to some molecules.
What are transverse extensions of the sarcolemma called?
The structure of muscle cells specifically is such that the tunnel-like extensions of the sarcolemma pass through the muscle cells from one side to the other, so they are said to be transverse. These extensions of the sarcolemma are called transverse tubules, which are often abbreviated simply as “tubules T”.