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What is the difference between a myofibril and a myocyte in muscle structure and function?
A myofibril is a thread-like structure within a muscle cell that contains the proteins responsible for muscle contraction. A myocyte, on the other hand, is the actual muscle cell that contains multiple myofibrils. In summary, myofibrils are the components within a myocyte that enable muscle contraction.
What is the difference between a muscle organ a muscle fiber myofibril and a myofilaments?
A muscle organ is made up of several muscle fibers, which are the individual cells that contract to produce movement. Each muscle fiber contains myofibrils, which are long, thread-like structures that run the length of the fiber and are responsible for contraction. Myofibrils are composed of myofilaments, the smallest units, which include actin (thin filaments) and myosin (thick filaments) that interact to facilitate muscle contraction. Together, these structures create the hierarchy of muscle organization from the whole muscle down to the molecular level.
Why is an individual skeleton muscle cell referred to as a muscle fiber?
An individual skeletal muscle cell is referred to as a muscle fiber because of its elongated, thread-like shape that resembles a fiber. These muscle fibers are multi-nucleated and contain specialized structures called myofibrils, which are responsible for contraction. The term "fiber" underscores the cell's role in forming the overall muscle tissue, emphasizing its function and structural characteristics.
What is a myofibril?
A myofibril is a bundle of contractile filaments (myofilaments), 1-2 μm in diameter, that are arranged in parallel groups in the cytoplasm of striated muscle cells.
Thread like structure in the nucleus?
Chromatin, which is DNA wrapped around proteins.
When we burn pure silk thread it smells similar to burning of hair. Explain?
It smells similar because of the proteins present in the silk thread. When we burn hair it has the same smell because proteins are also present in the hair (keratin).
When we burn a pure silk thread it smells similar to burning of hair explain?
It smells similar because of the proteins present in the silk thread. When we burn hair it has the same smell because proteins are also present in the hair (keratin).
Myofibrils are constructed of overlapping strands of protein polymers?
Yes, myofibrils are made up of repeating units called sarcomeres, which contain protein polymers called actin and myosin. These filaments slide past each other during muscle contraction, allowing for muscle movement. The arrangement of these proteins within the myofibrils gives muscles their striated appearance.
What are Long threadlike structures found in muscle fibers?
Myofibrils are thread like structures found in muscle fiber composed of bundles of myofilaments.
What is a bave?
A bave is a variety of silkworm thread extruded as brins from the two glands and stuck together with sericin proteins.
What are the thread like substances in the nucleus?
The thread-like substances in the nucleus are called chromatin. Chromatin is composed of DNA and proteins and plays a key role in packaging and organizing the genetic material within the nucleus.
When a eukaryotic cell is not undergoing mitosis the DNA and its associated proteins appear as a visible thread like mass called the?
chromatin
