What are these striations seen in skeletal and cardiac muscles? Sarcolemma and T tubules individual fascicles A bands and I bands dense bodies and calmodulin sarcoplasmic reticula and calcium
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Striations in skeletal and cardiac muscles are due to the arrangement of the myofilaments (actin and myosin) into repeating functional units called sarcomeres. The sarcomeres are organized into A bands (dark bands) and I bands (light bands). Show more…
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Supreeta N.
Terminal cisternae A cylindrical organelle made up of myofilaments and found within the sarcoplasm of the muscle cell. Myosin Sarcomere A modified smooth endoplasmic reticulum that surrounds each myofibril and stores Ca2+. Sarcolemma The plasma membrane of a muscle cell. Transverse (T) tubule Formed by an invagination of the sarcolemma. Sarcoplasmic reticulum Myofibril Made up of the T-tubule and two terminal cisternae. Sarcoplasm Enlargements of the SR on either side of the transverse tubules. Triad Contractile proteins that make up the thick filaments. Actin Contractile protein that makes up the thin filaments. Cytoplasm of a muscle cell. Functional unit of muscle contraction.
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