unit 10 review Essay

1124 Words Apr 21st, 2014 5 Pages
UNIT

10
Check Your Recall
1

REVIEW

Label the following terms on Figure 10.13.






Epimysium
Fascicle
Muscle fiber
Perimysium
Tendon

Tendon

Fascicle

Epimysium

Perimysium

Muscle fiber

FIGURE

10.13 Basic skeletal muscle structure

Muscle Tissue

R

UNIT

10 S 7

2

Label the following terms on Figure 10.14.
Ⅺ A band
Ⅺ I band
Ⅺ Myofibril

Ⅺ Nucleus
Ⅺ Sarcolemma
Ⅺ Sarcomere
T-tubule

Ⅺ Sarcoplasmic reticulum
Ⅺ T-tubule
Ⅺ Z disk

Sarcoplasmic reticulum
Myofibril
Sarcolemma

Z disk
I band

A band

Sarcomere
Nucleus

FIGURE

3

10.14 Skeletal muscle fiber

The striations in skeletal muscle fibers are attributable to
a. light and dark pigments found in the
…show more content…
Smooth
________________________________________ The cells lack striations and sarcomeres.
Skeletal, some cardiac
________________________________________ The cells are multinucleate.
Muscle Tissue

R

UNIT

10 S 9

UNIT

10
Check Your Understanding

REVIEW

Critical Thinking and Application Questions

1

Would a muscle cell be able to produce a functional contraction if it lacked T-tubules? Explain.
Without T-tubules, the action potential propagated along the sarcolemma would not have access to the inside of the muscle fiber or to the terminal cisternae. For this reason, a skeletal muscle fiber without T-tubules would not release adequate numbers of calcium ions to initiate a contraction.

2

The drug Botox® is made from the toxin of the bacterium Clostridium botulinum. It is injected subdermally to minimize fine lines and creases in the face. The toxin prevents motor neurons from releasing acetylcholine. How would this produce the desired cosmetic results? What could happen if this toxin were absorbed systemically?
The toxin prevents the muscles in the forehead from contracting, which reduces the appearance of wrinkles.
If absorbed systematically, the toxin could cause paralysis of all muscles, including the respiratory muscles.

3

Myasthenia gravis is an autoimmune disease in which the immune system produces antibodies that attack the

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