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Smooth Muscle Structure and Function

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Questions and Answers

What is the primary function of dense bodies in smooth muscle?

Regulating the release of calcium ions for muscle contraction

Anchoring actin filaments and transmitting force to adjacent cells (correct)

Supporting the structural integrity of the sarcolemma

Anchoring myosin filaments and controlling muscle contraction

What is the role of myosin filaments in smooth muscle?

Interspersed among the actin filaments to facilitate muscle contraction (correct)

Anchoring dense bodies and providing structural support

Regulating the release of calcium ions for muscle contraction

Linking contractile units to the sarcolemma

How are individual contractile units arranged in smooth muscle?

Myosin filaments radiating from two dense bodies overlapping multiple actin filaments

Actin filaments radiating from two dense bodies overlapping a single myosin filament (correct)

Dense bodies forming a lattice structure around actin and myosin filaments

Actin and myosin filaments arranged in parallel without overlap

What is the diameter relationship between myosin and actin filaments in smooth muscle?

Myosin filaments have more than twice the diameter of actin filaments Signup and view all the answers

How do some dense bodies in smooth muscle attach to adjacent cells?

Form bonds with dense bodies of adjacent cells to transmit force of contraction Signup and view all the answers

In smooth muscle, what is the function of dense bodies?

Anchoring actin filaments Signup and view all the answers

Which structural proteins link the dispersed dense bodies in smooth muscle?

Alpha-actinin Signup and view all the answers

What is the arrangement of myosin filaments in smooth muscle?

Interwoven with actin filaments Signup and view all the answers

What is the function of myosin filaments in smooth muscle?

Generating force for muscle contraction Signup and view all the answers

What is the role of dense bodies attached to the cell membrane in smooth muscle?

Forming bonds with adjacent cells' dense bodies Signup and view all the answers

Study Notes

Smooth Muscle Structure and Function

Dense bodies in smooth muscle are the primary sites for force transmission and anchoring of the actin filaments.
Myosin filaments in smooth muscle generate force through their interaction with actin filaments.
Individual contractile units in smooth muscle are arranged in a non-striated, irregular pattern.
In smooth muscle, the diameter of myosin filaments is thicker than that of actin filaments.
Some dense bodies in smooth muscle attach to adjacent cells through adherens junctions.
The function of dense bodies in smooth muscle is to act as anchoring sites for actin filaments and to transmit the force generated by the contraction of the muscle.
Structural proteins, such as vinculin and α-actinin, link the dispersed dense bodies in smooth muscle.
Myosin filaments in smooth muscle are arranged in a helical pattern, allowing for the generation of force in multiple directions.
The function of myosin filaments in smooth muscle is to generate force through their interaction with actin filaments.
Dense bodies attached to the cell membrane in smooth muscle act as anchoring sites, transmitting the force generated by muscle contraction to the surrounding tissue.

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Description

Test your knowledge of the structure and arrangement of actin and myosin filaments in smooth muscle cells, including the role of dense bodies and their attachment to the sarcolemma.