Do muscle cells contain cytoplasm?
The cytoplasm in a muscle cell is termed the sarcoplasm; the smooth endoplasmic reticulum of a muscle cell is termed the sarcoplasmic reticulum; and the cell membrane in a muscle cell is termed the sarcolemma.
What is equivalent to the muscle cell cytoplasm?
sarcoplasm: The cytoplasm of a myocyte. sarcoplasmic reticulum: The equivalent of the smooth endoplasmic reticulum in a myocyte.
What is the function of myocyte?
Myocytes are the cells within the heart tissue that generate the tiny electrical impulses that cause heart muscle cells to contract, and the heart to ‘beat.
How many nuclei do muscle cells have?
Skeletal muscle tissue has the most nuclei out of the different types. Cardiac has one or two nuclei per fiber, and smooth muscle cells only have one.
What are bundles of myofilaments called?
Long, thin bundles of myofilaments are called Myofibrils. ▪ Muscle cells are long cells packed with myofibrils and are therefore called muscle fibers.
What is myocyte made of?
The myocyte is composed of bundles of myofibrils that contain myofilaments (Figure 1). The myofibrils have distinct, repeating microanatomical units, termed sarcomeres, which represent the basic contractile units of the myocyte (Figure 2).
What are the two types of myocytes?
Cardiac and skeletal myocytes are sometimes referred to as muscle fibers due to their long and fibrous shape. Cardiac muscle cells, or cardiomyocytes, are the muscle fibers comprise the myocardium, the middle muscular layer, of the heart.
Which cells have multiple nuclei?
Liver cells, muscle fibers, and osteoclasts are all normal cells that often have more than one nucleus. Cancerous cells and those infected with viruses can also have multiple nuclei at times. In addition to human cells, certain types of fungi have multinucleated cells.
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 the a band?
The A band is the region of a striated muscle sarcomere that contains myosin thick filaments. In fact, the A band is the entire length of the thick filament of the sarcomere. Its length is approximately 1 μm. The center of the A band is located at the center of the sarcomere (M line).
What is the function of the myocyte?
The muscle myocyte is a cell that has differentiated for the specialized function of contraction. Although cardiac, skeletal, and smooth muscle cells share much common functionality, they do not all share identical features, anatomical structures, or mechanisms of contraction.