Video 4: Skeletal Muscle Levels of Organization

What is a bundle of muscle fibers?

• sarcoplasm

• sarcolemma

• myofibril

• fascicle 

Which of the following is NOT an organelle?

• sarcoplasmic reticulum

• myofibril

• transverse tubules

• sarcolemma

• fascicle

What is the thick filament?

• actin

• myosin

• sarcomere

• myofibril

What will get closer together during a contraction?

• myosin heads

• actin to myosin

• z-lines

• myofibrils

What type of molecule are actin and myosin?

• carbohydrates

• phospholipids

• ions

• proteins

What structure is bigger?

• myofibril

• myofilament

What is 1?

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What is 2?

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What is 3?

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What is number 4?

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