10 Questions
What type of filaments are longitudinally arranged in the myofibrils?
Thread-like Filaments
Where does the extension of thick filaments occur?
From Z-line to H-zone
Which protein is NOT part of the protein content of myofilaments?
Myosin
Why is the A band dark in appearance?
It contains both actin and myosin filaments
What is the role of the sarcolemma in muscle contraction?
To conduct excitatory signals to the myofibrils
What is the role of the triad in muscle contraction?
Pumping Ca ions into the myofibrils
What happens when the thin filaments slide towards the middle of the sarcomere?
The H-zone becomes more visible
How does energy release from ATP contribute to muscle contraction?
It allows myosin to interact with actin
What is the function of the terminal cisternae in muscle contraction?
Release Ca ions into the myofibrils
How does the Sarcoplasm transmit nerve impulses to the sarcoplasmic reticulum?
Via the T.T. of the triads
Explore the characteristics of myofilaments, including thin and thick filaments, their extensions, arrangement in the A-band, and protein content. Learn about the protein components such as actin, tropomyosin, and troponin, as well as the role of myosin. Understand the dark A-band and light I-band distinctions in muscle tissue.
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