Podcast
Questions and Answers
What protein is a calcium-sensitive switch that regulates myosin’s access to the actin microfilament?
What protein is a calcium-sensitive switch that regulates myosin’s access to the actin microfilament?
- Tropomyosin
- Actin
- Troponin (correct)
- Myosin
What defines the distance from one Z line to another in a sarcomere?
What defines the distance from one Z line to another in a sarcomere?
- Actin
- Thick filaments
- Myosin
- Sarcomere length (correct)
Which type of filaments are anchored at the Z lines?
Which type of filaments are anchored at the Z lines?
- Thick filaments
- Tropomyosin
- Myosin
- F-actin (correct)
What is responsible for muscle contraction according to the sliding-filament model?
What is responsible for muscle contraction according to the sliding-filament model?
What holds the thin and thick filaments together during muscle contraction?
What holds the thin and thick filaments together during muscle contraction?
What type of structure requires energy for the sliding of thin filaments past thick filaments?
What type of structure requires energy for the sliding of thin filaments past thick filaments?
What is the primary function of myosins in cellular events?
What is the primary function of myosins in cellular events?
Which statement accurately describes the structure of myosins?
Which statement accurately describes the structure of myosins?
In what direction are most myosins motors directed?
In what direction are most myosins motors directed?
What is a common function of Type II myosins?
What is a common function of Type II myosins?
What is the role of light chains in myosins?
What is the role of light chains in myosins?
What is a characteristic feature of myosin II molecules?
What is a characteristic feature of myosin II molecules?
What is the role of ATP in muscle contraction?
What is the role of ATP in muscle contraction?
In skeletal muscle cells, what leads to muscle relaxation?
In skeletal muscle cells, what leads to muscle relaxation?
What is responsible for regulating the availability of myosin-binding sites on actin filaments?
What is responsible for regulating the availability of myosin-binding sites on actin filaments?
Which event allows myosin to bind to actin filaments during muscle contraction?
Which event allows myosin to bind to actin filaments during muscle contraction?
Which type of muscle contraction is responsible for involuntary contractions?
Which type of muscle contraction is responsible for involuntary contractions?
What are the dense bodies found in smooth muscles responsible for?
What are the dense bodies found in smooth muscles responsible for?
What causes a conformational change in myosin in smooth muscle cells?
What causes a conformational change in myosin in smooth muscle cells?
What removes phosphate from the myosin light chain in smooth muscle cells to promote relaxation?
What removes phosphate from the myosin light chain in smooth muscle cells to promote relaxation?
