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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
Q

Connective tissue which envelops muscles

A

Epimysium

26
Q

external sheath of dense irregular connective tissue, surrounds the entire muscle

A

Epimysium

27
Q

Connective tissue which envelops muscle bundles/fascicles

A

Perimysium

28
Q

thin connective tissue layer that immediately surrounds each bundle of muscle fibers termed a fascicle

A

Perimysium

29
Q

Surrounds muscle fibers

A

Endomysium

30
Q

Surrounds the external lamina of individual muscle fibers.

A

Endomysium

31
Q

Endomysium consists of

A

Basal Lamina + Free Reticular Fibers + Connective Tissues Elements

32
Q

Where is the nucleus of skeletal muscle located?

A

Periphery

33
Q

dark line which bisects I-Band
(middle of I-Band)

A

Z-Line

34
Q

Other names of Z-line

A

Zwischenscheiben Line; Z-band; Z-disc

35
Q

Z-line to Z-line

A

Sarcomere

36
Q

Repeating units which make up Myofibrils

The repetitive functional subunit of the contractile apparatus

A

Sarcomere

37
Q

lighter zone in center of A-Band

A

H-Band

38
Q

Other names for H-Band

A

Henle’s Band; Heller Band; Hell Band; Henson’s Band

39
Q

thin, dark band which bisects the H-Band

A

M-Line

40
Q

Other name for M-line

A

Mittelscheibe Line

41
Q

contract at slower rate but capable of continuous contraction

A

Red (Slow Twitch) Muscle

42
Q

do not fatigue easily

A

Red

43
Q

richer blood supply

A

Red

44
Q

high content of red pigments (Myoglobin and Mitochondrial Cytochromes)

A

Red

45
Q

many mitochondria

A

Red

46
Q

smaller in diameter

A

Red

47
Q

contract rapidly but briefly

A

White (Fast Twitch) Muscle

48
Q

fatigues fast

A

White

49
Q

low Myoglobin content

A

White

50
Q

fewer Mitochondria

A

White

51
Q

large in diameter

A

White

52
Q

Slow, Oxidative Fibers
- ATP from Oxidative phosphorylation

A

Type I

53
Q

Fast, Oxidative-Glycolytic Fibers
- ATP from Oxidative phosphorylation

A

Type IIA

54
Q

Fast, Glycolytic Fibers
- ATP from ANaerobic glycolysis

A

Type IIB

55
Q

Uni/ binucleated
Striated
Branching
Involuntary

A

Cardiac Muscle

56
Q

unique in cardiac muscles

A

INTERCALATED DISCS

57
Q

Elongated
Individual fibers
Single, ovoid, & centrally-located nucleus
Shape: spindled w/ tapered ends

A

Smooth Muscle

58
Q

Distinctive characteristic of Skeletal Muscle

A

Peripheral nuclei

59
Q

Distinctive characteristic of Cardiac Muscle

A

Intercalated disc

60
Q

Distinctive characteristic of Smooth Muscle

A

No Striations

Histo LEC (26 decks)

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