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Questions and Answers
What structural component of smooth muscle provides structural stability?
What structural component of smooth muscle provides structural stability?
- Troponin
- Intermediate filaments (correct)
- Thick filament
- Actin
What is the role of myosin light chain in smooth muscle contraction?
What is the role of myosin light chain in smooth muscle contraction?
- Binds to actin when phosphorylated (correct)
- Activates calmodulin
- Releases calcium ions
- Facilitates ATP hydrolysis
Which type of smooth muscle is characterized as neurogenic?
Which type of smooth muscle is characterized as neurogenic?
- Multiunit (correct)
- Single unit
- Phasic
- Non-phasic
What happens to the thin filaments during smooth muscle contraction?
What happens to the thin filaments during smooth muscle contraction?
Which molecule binds with calmodulin to initiate the cross-bridge cycle in smooth muscle contraction?
Which molecule binds with calmodulin to initiate the cross-bridge cycle in smooth muscle contraction?
What replaces Z lines in smooth muscle cells since they lack sarcomeres?
What replaces Z lines in smooth muscle cells since they lack sarcomeres?
Which type of muscle has filaments that send signals in opposite directions rather than in the middle?
Which type of muscle has filaments that send signals in opposite directions rather than in the middle?
What is the primary role of myosin light chain kinase in smooth muscle contraction?
What is the primary role of myosin light chain kinase in smooth muscle contraction?
What is the structural significance of the dense bodies in smooth muscle?
What is the structural significance of the dense bodies in smooth muscle?
Explain the role of myosin light chain phosphorylation in smooth muscle contraction.
Explain the role of myosin light chain phosphorylation in smooth muscle contraction.
What is the function of calmodulin in smooth muscle contraction?
What is the function of calmodulin in smooth muscle contraction?
Describe the arrangement of thick and thin filaments in smooth muscle cells during contraction.
Describe the arrangement of thick and thin filaments in smooth muscle cells during contraction.
What is the role of intermediate filaments in smooth muscle cells?
What is the role of intermediate filaments in smooth muscle cells?
How does multiunit smooth muscle differ from single unit smooth muscle?
How does multiunit smooth muscle differ from single unit smooth muscle?
Explain the significance of myosin light chain kinase in the cross-bridge cycle.
Explain the significance of myosin light chain kinase in the cross-bridge cycle.
How do the thick filaments in smooth muscle differ from those in skeletal muscle?
How do the thick filaments in smooth muscle differ from those in skeletal muscle?
Smooth muscle cells have sarcomeres similar to skeletal muscles.
Smooth muscle cells have sarcomeres similar to skeletal muscles.
Calmodulin activates myosin light chain kinase by binding to it.
Calmodulin activates myosin light chain kinase by binding to it.
Multiunit smooth muscle is referred to as phasic and originates from neural stimulation.
Multiunit smooth muscle is referred to as phasic and originates from neural stimulation.
The myosin light chain must be dephosphorylated for the myosin head to bind to actin in smooth muscle contraction.
The myosin light chain must be dephosphorylated for the myosin head to bind to actin in smooth muscle contraction.
Thin filaments in smooth muscle cells pass in the same direction along the thick filaments during contraction.
Thin filaments in smooth muscle cells pass in the same direction along the thick filaments during contraction.
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