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smooth muscle
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∙ 15y ago
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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 a human characteristic?
An example of a human characteristic is trustworthy.A human characteristic is something that all humans have.
A characteristic of a DNA molecule that is not a characteristic of a protein molecule is that the DNA molecule?
A characteristic of a DNA molecule that is not characteristic of a protein molecule is that the DNA molecule can replicate itself.
The physical characteristic of an organism?
A physical characteristic of an organism are its phenotype. The phenotype comes from the organisms genes and the environment it lives in.
Which feature of the cell wall is characteristic of bacteria but not of archaea?
the peptidoglycan fature of the cell wall is a characteristic.
How is Animals with dense fur characteristic?
warm clothing and bendding
Why is it that you float on water?
Because water is more dense then our bodies so when things are more dense they sink to the bottom and when they are less dense they float to the top
An anatomical feature unique to smooth muscle is?
dense bodies
Is dense a metal or non metal?
The density is a physical characteristic of all materials.
What is the shape of dense bodies the size of planets or larger?
Approximately "spherical".
What is a characteristic of cold air?
Cold Air is more dense than Warm Air.
What are some characteristic of solids?
dense, tightly packed molecules, maintains own shape and volume
What is a characteristic of Echinoderms?
Invertebrate animals with spikes and spines all over their bodies.
What structures anchor thin filaments?
I believe the Z-lines anchor the Thin filaments
Why do hippos swim?
Hippos can't swim! Their bodies are to dense to float!
What are the characteristic of the oceanic crust?
The rocks that makes up the oceanic crusts, are very dark, relatively thin and highly dense.
Will there be aschoff bodies in sarcoidosis?
No. Aschoff bodies are nodules found in the hearts of individuals with rheumatic fever. They result from inflammation in the heart muscle and are characteristic of rheumatic heart disease.
