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What gives muscle fibers their striations?
The units of contraction called sarcomeres give striated muscle this appearance. Smooth muscle also has sarcomeres but they are not as neatly arranged so they appear smooth.
Do skeletal muscle fibers contain sarcomeres whereas smooth muscle fibers do not?
true
Do smooth muscle cells lack striations?
Yes they do lack striations. They do not have striations because they do not have sarcomeres. Instead, smoothe muscle contracts as one unit through the use of electrical impulses.
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 are individual muscle cells termed?
Another name is myocyte. It is formed from a myoblast. There are three types: smooth, striated and cardiac cells.
What gives muscle fibers their striations?
The units of contraction called sarcomeres give striated muscle this appearance. Smooth muscle also has sarcomeres but they are not as neatly arranged so they appear smooth.
What muscle tissue type do not contain sarcomeres?
Smooth.
Does smooth muscle have z lines?
No, smooth muscle is poorly organized and do not have the Z lines which are characteristic of sarcomeres.
Do skeletal muscle fibers contain sarcomeres whereas smooth muscle fibers do not?
true
What muscle types has only one nucleus no sarcomeres and rare gap junctions?
Multi-unit Smooth Muscle.
Do smooth muscle cells posses central nuclei but lack striations?
Smooth muscle is not striated, hence the name smooth muscle.nonotcardiac muscle
What is the functional unit of muscle?
sarcomeres
What does a muscle do so the sarcomeres shortens?
The sarcomeres shortens when the muscle contract. By Adam Safi
Is tropomyosin found in smooth muscle?
smooth muscle doesn't have troponin, instead it has caldmodulin
What is Non-striated involuntary muscle type?
its Smooth muscle is an involuntary non-striated muscle, so-called because it has no sarcomeres and therefore no striations (bands or stripes). It is divided into two subgroups, single-unit and multiunit smooth muscle. Within single-unit muscle, the whole bundle or sheet of smooth muscle cells contracts as a syncytium. lol i know more than u
Do smooth muscle cells lack striations?
Yes they do lack striations. They do not have striations because they do not have sarcomeres. Instead, smoothe muscle contracts as one unit through the use of electrical impulses.
Does cardiac muscles have sarcomeres?
Only striated muscles have sarcomeres , Skeletal and Cardiac muscles have sarcomeres. As for smooth muscles they doesnt have sarcomeres , since the Z lines are attached to dense bodies
