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How can smooth muscle contract if it has no striation or sacromeres?
The proteins that form the visible striations in skeletal and cardiac muscle are not organized the same way in smooth muscle. It contacts in a similar way but much more slowly and in waves. Some of the proteins are different ones but still produce movement.
Can you see sarcomeres in smooth muscle?
No, sarcomeres are not visible in smooth muscle. Smooth muscle lacks the organized sarcomere structure found in striated muscle, such as skeletal and cardiac muscle. Instead, smooth muscle has a more scattered arrangement of contractile proteins.
What is the line or streak across a muscle called?
Microscopically you could be seeing sacromeres. Otherwise, these streaks are called striations.
What are the key differences in the structure and function of cardiac muscle compared to skeletal muscle?
Cardiac muscle is found in the heart and is involuntary, meaning it contracts without conscious control. It has intercalated discs for rapid communication between cells. Skeletal muscle is attached to bones and is voluntary, allowing for conscious movement. It lacks intercalated discs but has striations for organized contraction.
What is the difference between visceral muscle and skeletal muscle?
1) skeletal muscle is voluntary 1) visceral muscle is involuntary 2) it is striated . 2) it is non striated 3) highly organized muscle. 3) less organized muscle
Why is smooth muscle called smooth muscle?
Because it lacks striations the muscle appears to look very smooth under a microscope.
Intercalated discs and striations suggest the presence of skeletal muscle?
Actually, intercalated discs and striations are unique features of cardiac muscle, not skeletal muscle. These structures help cardiac muscle cells work together as a functional unit, allowing the heart to contract efficiently. Skeletal muscle lacks intercalated discs and striations are more organized in a linear pattern.
Which structure is defined by the borders called Z-lines?
Sacromeres
What is the specific relationship of the functional unit of contraction to the striated appearance of a skeletal muscle fiber?
The organization of contractile proteins into a regular end-to-end repeating pattern of sacromeres along the length of each cell accounts for the striated, or striped, appearance of skeletal muscle in longitudinal section.
Which type of muscle moves contents through hollow organs such as the intestines?
Something called smooth muscle moves the walls of all hollow organs except the heart. The muscle is called smooth because the microscopic subunits called sacromeres are not in any special arrangement. Skeletal muscle is called striated muscle because these units are in a uniform arrangement that appear as striations when seen under the microscope.
How do you know that a bacterial cell is a prokaryotic cell?
It does not has an organized nucleus.It also lacks membranous organells.
What is a contractible unit of muscle?
Sarcomere
