Chapter 6: Microscopic Anatomy of Skeletal Muscle. Flashcards

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1
Q

Is skeletal muscle multinucleate?

A

Yes

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2
Q

Sarcolemma

A

Plasma membrane that covers groups of muscle fibers.

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3
Q

Myofibrils

A

Nearly fill the cytoplasm (Sarcolemma) and push aside nuclei. Long ribbon like organelles.

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4
Q

Sarcomeres

A

Made up of myofibrils which are chains of tiny contractile units.

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5
Q

Myofiliments

A

Structures that producer the banding pattern inside the sarcomere.

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6
Q

Myosin Filaments

A

Thick filaments made up of bundles of molecules of myosin protein. They also contain ATP enzymes. They extend the entire length of the dark band.

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7
Q

Cross bridges

A

Studded ends of myosin filaments that hold muscle together during contraction.

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8
Q

Actin

A

Also protein molecule that is thin, which is anchored to the Z disk.

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9
Q

Sarcoplasmic Reticulum

A

Interconnecting tubules and sacs that surround every myofibril.

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10
Q

What is the major role of the sarcoplasmic reticulum?

A

To store calcium and release it to give the final go signal to muscle for contraction.

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