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no. Only skeletal and cardiac muscles have T tubules.
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∙ 14y ago
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This transverse structure unique to muscle cells?
T-Tubules, I think...
What are calcium ions stores as in muscle cells?
sarcoplasmic reticulum, i think. either that are T tubules
What are the tunnel-like extensions of the sarcolemma into the muscle fiber?
transverse tubules transverse tubules
What are the muscle action potential penetrates into a fiber along the?
Transverse tubules (T-Tubules)
The command to contract is distributed throughout a muscle fiber by the?
Transverse Tubules
Which muscle has the widest T tubules?
Cardiac muslce.
The action potential is conducted into a skeletal muscle fiber by?
neuromuscular junctions Action potentials conduct down T tubules into skeletal muscles
How can smooth muscle contract if it has no striation or sarcomeres?
Actin and myosin are present in all three muscle types. In skeletal and cardiac muscle cells, these proteins are organized in sarcomeres, with thin and thick filaments. The internal organization of a smooth muscle cell is very different: • A smooth muscle fibre has no T tubules, and the sarcoplasmic reticulum (SR) forms a loose network throughout the sarcoplasm. Smooth muscle tissue has no myofibrils or sarcomeres. As a result, this tissue also has no striations and is called nonstriated muscle. • Thick filaments are scattered throughout the sarcoplasm of a smooth muscle cell. The myosin proteins are organized differently than in skeletal or cardiac muscle cells, and smooth muscle cells have more cross-bridges per thick filament. • The thin filaments in a smooth muscle cell are attached to dense bodies, structures distributed throughout the sarcoplasm in a network of intermediate filaments composed of the protein desmin. Some of the dense bodies are firmly attached to the sarcolemma. The dense bodies and intermediate filaments anchor the thin filaments such that, when sliding occurs between thin and thick filaments, the cell shortens. Dense bodies are not arranged in straight lines, so when a contraction occurs, the muscle cell twists like a corkscrew. • Adjacent smooth muscle cells are bound together at dense bodies, transmitting the contractile forces from cell to cell throughout the tissue. • Although smooth muscle cells are surrounded by connective tissue, the collagen fibres never unite to form tendons or aponeuroses as they do in skeletal muscles.
What is the function of the transverse tubules in muscle activation?
What is the function of the transverse tubules, is it the place where actin and myosin interact or the storage of calcium ions, or to transmit muscle impulses into the cell interior?
What period is characterized by calcium ions release into cytosol and depolarization of the sarcolemma and T tubules?
The period that would be characterized by those things would be muscle contraction. Calcium ions are the neurotransmitters that cause contraction. Calcium Ions depolarize the cell and are spread through out the muscle via the T tubules.
What do action potentials travel down to cause muscle contraction?
Axon of neuron, sarcolemma, and T-tubules.
What is the function role of t tubules?
Enhance cellular communication passage for nervous stimulation during muscle contraction.
