Myofibrils usually range in diameter

1. 1 to 2um
2. 3 to 5 um
3. 6 um
4. 7um
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Answer: A
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Muscles are attached to bones with

1. cartilage
2. tendons
3. ligaments
4. costal cartilage
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Answer: B
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I band of myofibrils is composed of

1. actin
2. myosin
3. both a,b
4. none
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Answer: A
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A band usaully comprises of

1. thin filaments
2. thick filaments
3. thick filaments only
4. both a and b
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Answer: D
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Transversing the middle of each I band is

1. M line
2. dark Z line
3. T tubules
4. none
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Answer: B
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The section of myofibrils between tow Z lines is

1. sarcomere
2. muscle contractile unit
3. sarcoplasm
4. both a ,b
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Answer: D
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Center of sarcomere usually comprise

1. actin filaments
2. only myosin filaments
3. both actin and myosin
4. only actin
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Answer: B
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How many actin filaments surround each myosin filament

1. Two
2. Four
3. Six
4. eight
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Answer: C
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A stands for anisotropic which means

1. can polarize visible light
2. connot polarize light
3. its dark band
4. All
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Answer: A
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The region of A band in relaxed state where no overlap is found between actin and myosin filament

1. H zone
2. M line
3. Hele
4. both a and c
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Answer: D
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