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Histo LEC > Muscle > Flashcards

Muscle Flashcards

1
Q
  • muscle cells
A

Muscle Fiber

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2
Q
  • cell membrane of muscle cells
A

Sarcolemma

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3
Q
  • sER
A

Sarcoplasmic Reticulum

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4
Q
  • mitochondria
A

Sarcosomes

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5
Q
  • cytoplasm
A

Sarcoplasm

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6
Q
  • sequester (separate) calcium; specialized smooth ER
A

:
Sarcoplasmic reticulum

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7
Q

Muscle is classified into three types:

A

Skeletal muscle
Cardiac muscle
Smooth muscle

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8
Q

contractile filaments contain

A

actin and myosin

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9
Q

Contraction may be:

A

voluntary (skeletal muscles)

involuntary (cardiac and smooth muscles)

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10
Q

All muscle tissues consist of elongated cells called

A

fibers

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11
Q

The cytoplasm of muscle cells is called_________, and the surrounding cell membrane or plasmalemma is called___________.

A

sarcoplasm

sarcolemma

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12
Q

Comprised all named voluntary muscles in the body

A

Skeletal

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13
Q

Examples of skeletal muscle

A

Gastrocnemius
Latissimus Dorsi

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14
Q

limited to Heart (Myocardium) and Large Blood Vessels attached to heart

A

Cardiac

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15
Q

Present in walls and parenchyma of most visceral organs

walls of blood vessels

skin

A

Smooth

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16
Q

contains bundles of very long, multinucleated cells with cross-striations.

A

Skeletal muscle

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17
Q

Their contraction is quick, forceful, and usually under voluntary control.

A

Skeletal muscle

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18
Q

also has cross-striations and is composed of elongated, often branched cells bound to one another at structures called intercalated discs which are unique to _______ muscle.

A

Cardiac muscle

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19
Q

Contraction is involuntary, vigorous, and rhythmic.

A

Cardiac muscle

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20
Q

consists of collections of fusiform cells which lack striations

A

Smooth muscle

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21
Q

Have slow, involuntary contractions

A

Smooth muscle

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22
Q

Skeletal Muscle:
Shape of fibers and number of nucleus

A

Cylindrical/ tubular
Multinucleated

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23
Q

Smooth Muscle:
Shape of fibers and number of nucleus

A

Spindle shaped

Uninucleated

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24
Q

Cardiac Muscle:
Shape of fibers and number of nucleus

A

Branched

Uni or Binucleated

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25
Connective tissue which envelops muscles
Epimysium
26
external sheath of dense irregular connective tissue, surrounds the entire muscle
Epimysium
27
Connective tissue which envelops muscle bundles/fascicles
Perimysium
28
thin connective tissue layer that immediately surrounds each bundle of muscle fibers termed a fascicle
Perimysium
29
Surrounds muscle fibers
Endomysium
30
Surrounds the external lamina of individual muscle fibers.
Endomysium
31
Endomysium consists of
Basal Lamina + Free Reticular Fibers + Connective Tissues Elements
32
Where is the nucleus of skeletal muscle located?
Periphery
33
dark line which bisects I-Band (middle of I-Band)
Z-Line
34
Other names of Z-line
Zwischenscheiben Line; Z-band; Z-disc
35
Z-line to Z-line
Sarcomere
36
Repeating units which make up Myofibrils The repetitive functional subunit of the contractile apparatus
Sarcomere
37
lighter zone in center of A-Band
H-Band
38
Other names for H-Band
Henle's Band; Heller Band; Hell Band; Henson's Band
39
thin, dark band which bisects the H-Band
M-Line
40
Other name for M-line
Mittelscheibe Line
41
contract at slower rate but capable of continuous contraction
Red (Slow Twitch) Muscle
42
do not fatigue easily
Red
43
richer blood supply
Red
44
high content of red pigments (Myoglobin and Mitochondrial Cytochromes)
Red
45
many mitochondria
Red
46
smaller in diameter
Red
47
contract rapidly but briefly
White (Fast Twitch) Muscle
48
fatigues fast
White
49
low Myoglobin content
White
50
fewer Mitochondria
White
51
large in diameter
White
52
Slow, Oxidative Fibers - ATP from Oxidative phosphorylation
Type I
53
Fast, Oxidative-Glycolytic Fibers - ATP from Oxidative phosphorylation
Type IIA
54
Fast, Glycolytic Fibers - ATP from ANaerobic glycolysis
Type IIB
55
Uni/ binucleated Striated Branching Involuntary
Cardiac Muscle
56
unique in cardiac muscles
INTERCALATED DISCS
57
Elongated Individual fibers Single, ovoid, & centrally-located nucleus Shape: spindled w/ tapered ends
Smooth Muscle
58
Distinctive characteristic of Skeletal Muscle
Peripheral nuclei
59
Distinctive characteristic of Cardiac Muscle
Intercalated disc
60
Distinctive characteristic of Smooth Muscle
No Striations

Histo LEC (26 decks)

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