Micro Exercise 2

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M14_MARI6128_10_SE_CH14.QXD

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NAME_________________________________ LAB TIME/DATE ________________________ EXERCISE

R E V I E W

S H E E T

14
Key: a. b. endomysium epimysium fascicle fiber myofibril myofilament perimysium sarcolemma sarcomere sarcoplasm tendon

Microscopic Anatomy and Organization of Skeletal Muscle
Skeletal Muscle Cells and Their Packaging into Muscles
1. Use the items in the key to correctly identify the structures described below.

G C ____________ ________ I ____________ ________ E ____________ ________ A ____________ ________ J ____________ ________ D ____________ ________

____________ ________ 1. 2. 3. 4. 5. 6. 7.

connective tissue ensheathing a bundle of muscle cells bundle of muscle cells

c. contractile unit of muscle a muscle cell thin reticular connective tissue surrounding each muscle cell plasma membrane of the muscle fiber a long filamentous organelle with a banded appearance found within muscle cells actin- or myosin-containing structure cord of collagen fibers that attaches a muscle to a bone d. e. f. g. h. i. j. k. 9.

F K ____________ ________

____________ ________ 8.

2. List three reasons why the connective tissue wrappings of skeletal muscle are important.

It provides strength to the muscle so it can endure everyday activities. ____________________________________________________________________________________________ _______

It provides a connection place for muscle fibers It helps provide a route for blood vessels. ____________________________________________________________________________________________ _______ ____________________________________________________________________________________________ _______ 3. Why are there more indirect—that is, tendinous—muscle attachments to bone than there are direct attachments? ____________________________________________________________________________________________ _______ ____________________________________________________________________________________________ _______ ____________________________________________________________________________________________ _______ 4. How does an aponeurosis differ from a tendon structurally? ___________________________________________________ ____________________________________________________________________________________________ _______ How is an aponeurosis functionally similar to a tendon? ______________________________________________________ ____________________________________________________________________________________________ _______ 193

They are able to endure more of the rougher parts of bones that direct attachments can not.

A tendon looks like a cord that is very strong

and an aponeurosis has more of a flat thin appearance. an aponeurosis attaches muscle to muscle.

A tendon attaches bone to muscle and

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C

P

B

j

i C

i

/CA/SF

A

M i b/Mi h ll/S IIi

P N

193

C/M/Y/K

DESIGN SERVICES OF

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Review Sheet 14

5. The diagram illustrates a small portion of several myofibrils. Using letters from the key, correctly identify each structure indicated by a leader line or a bracket. Key: a. b. c. A band actin filament I band d. e. f. myosin filament T tubule terminal cisterna g. h. i. triad sarcomere Z disc

H
A

C

D
B

I
G
F

E

6. On the following figure, label a blood vessel, endomysium, epimysium, a fascicle, a muscle cell, perimysium, and the tendon.

Endomysium
Blood vessel

Perimysium

Muscle Cell
Tendon

Epimysium

Fascicle

# 102382

C

P

B

j

i C

i

/CA/SF

A

M i b/Mi h ll/S IIi

P N

194

C/M/Y/K

DESIGN SERVICES OF

M14_MARI6128_10_SE_CH14.QXD

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5:58 PM

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Review Sheet 14

195

The Neuromuscular Junction
7. Complete the following statements: 1. The junction between a motor neuron’s...
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