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Myofilaments in Muscle Structure

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Questions and Answers

What type of filaments are longitudinally arranged in the myofibrils?

Thread-like Filaments (correct)

Flat Filaments

Round Filaments

Spiral Filaments

Where does the extension of thick filaments occur?

From Z-line to A-band

From Z-line to I-band

From Z-line to M-line

From Z-line to H-zone (correct)

Which protein is NOT part of the protein content of myofilaments?

Troponin

Tropomyosin

Actin

Myosin (correct)

Why is the A band dark in appearance?

It contains both actin and myosin filaments Signup and view all the answers

What is the role of the sarcolemma in muscle contraction?

To conduct excitatory signals to the myofibrils Signup and view all the answers

What is the role of the triad in muscle contraction?

Pumping Ca ions into the myofibrils Signup and view all the answers

What happens when the thin filaments slide towards the middle of the sarcomere?

The H-zone becomes more visible Signup and view all the answers

How does energy release from ATP contribute to muscle contraction?

It allows myosin to interact with actin Signup and view all the answers

What is the function of the terminal cisternae in muscle contraction?

Release Ca ions into the myofibrils Signup and view all the answers

How does the Sarcoplasm transmit nerve impulses to the sarcoplasmic reticulum?

Via the T.T. of the triads Signup and view all the answers