Chapter 6: Microscopic Anatomy of Skeletal Muscle.

Question 1

Is skeletal muscle multinucleate?

Answer 1

Yes

Question 2

Sarcolemma

Answer 2

Plasma membrane that covers groups of muscle fibers.

Question 3

Myofibrils

Answer 3

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

Question 4

Sarcomeres

Answer 4

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

Question 5

Myofiliments

Answer 5

Structures that producer the banding pattern inside the sarcomere.

Question 6

Myosin Filaments

Answer 6

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.

Question 7

Cross bridges

Answer 7

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

Question 8

Actin

Answer 8

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

Question 9

Sarcoplasmic Reticulum

Answer 9

Interconnecting tubules and sacs that surround every myofibril.

Question 10

What is the major role of the sarcoplasmic reticulum?

Answer 10

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