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Histology > Muscle PDF > Flashcards

Muscle PDF Flashcards

1
Q

Forms the main bulk/flesh of the human body

A

MUSCULAR TISSUES

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2
Q

Function of muscular tissue

A

contractility

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3
Q

TYPES OF MUSCLES

A
  1. Striated
    – Skeletal muscle (voluntary)
    – Cardiac muscle (involuntary)
  2. Smooth muscle (involuntary)
  3. Contractile filaments (actin and myosin)
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4
Q

Bundles of very long, cylindrical, multinucleated cells that show cross-striations.

A

SKELETAL MUSCLE [VOLUNTRAY]

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5
Q

Muscles attach to the skeleton

A

SKELETAL MUSCLE [VOLUNTRAY]

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6
Q

striated, voluntary

A

SKELETAL MUSCLE [VOLUNTRAY]

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7
Q

long, broad tubular muscle fiber

A

SKELETAL MUSCLE [VOLUNTRAY]

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8
Q

contains cylindrical filaments called myofibril (smaller unit of muscle fiber)

A

SKELETAL MUSCLE [VOLUNTRAY]

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9
Q

CONNECTIVE TISSUE INVESTMENTS

A

EPIMYSIUM
PERIMYSIUM
ENDOMYSIUM

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10
Q

surrounds entire muscle

A

EPIMYSIUM

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11
Q

surrounds muscle bundles or fascicles (smaller unit of muscle bundles)

A

PERIMYSIUM

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12
Q

Encloses the muscle fiber

A

ENDOMYSIUM

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13
Q

Composes the muscle fascicle

A

ENDOMYSIUM

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14
Q

surrounds individual muscle cells

A

ENDOMYSIUM

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15
Q

Reticular fibers and external lamina

A

ENDOMYSIUM

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16
Q

Long, cylindrical, multinucleate

A

SKELETAL MUSCLE CELLS

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17
Q

Sarcoplasm, sarcolemma with T (transverse) tubules

A

SKELETAL MUSCLE CELLS

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18
Q

long cylindrical filament bundles

A

MYOFIBRILS

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19
Q

Parallel to the long axis of the fiber

A

MYOFIBRILS

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20
Q

Thick filaments

A

myosin

21
Q

Thin filaments

A

actin

22
Q

Visible Dark A bands, light I(isotropic) bands (bisected by Z disks)

A

MYOFIBRILS

23
Q

DESMIN (with plectin) glues Z disks together

A

MYOFIBRILS

24
Q

CROSS-STRIATIONS

A

A-bands
I-bands
H-bands
M lines
Z disks (lines)

25
Q

Anisotropic; stain dark; thin and thick filaments

A

A-bands

26
Q

Isotropic; light stain; thin filaments

A

I-bands

27
Q

Light regions transecting A bands; thick filaments

A

H-bands

28
Q

Narrow dark regions at center of H bands; cross-bridges

A

M lines

29
Q

Dense regions bisecting I-band

A

Z disks (lines)

30
Q

extends Z to Z disc

A

SARCOMERE

31
Q

Functional unit of contraction (fibril)

A

SARCOMERE

32
Q

Dilated terminal cisternae that encircle myofibrils at the junction of each A and I band

A

SACROPLASMIC RETICULUM

33
Q

Regulates muscle contraction by calcium sequestration (relax) and release (contract)

A

SACROPLASMIC RETICULUM

34
Q

Central T tubule flanked by 2 terminal cisternae of SR

A

TRIADS

35
Q

Help provide uniform contraction

A

TRIADS

36
Q

THIN FILAMENTS [ACTIN]

A

F-ACTIN
TROPOMYSIN
TROPONIN

37
Q

double helix arrangement

A

F-ACTIN

38
Q

has an active site for interacting with myosin

A

F-ACTIN

39
Q

In the grooves of the F-actin helix

A

TROPOMYSIN

40
Q

TROPONIN

A

TnT
Tnc
TnI

41
Q

bind to tropomyosin

A

TnT

42
Q

4 binding sites for calcium

A

Tnc

43
Q

binds to actin, inhibiting myosin-actin interaction

A

TnI

44
Q

2 identical heavy chains and 2 pairs of light chains

A

Myosin II

45
Q

Double-headed golf club

A

Myosin II

46
Q

Globular heads (S1 fragments) have ATPase activity but require interaction with actin to release ADP and Pi.

A

Myosin II

47
Q

During contraction, thick and thin filaments do not shorten but increase their overlap

A

HUXLEY’S SLIDING-FILAMENT MODEL

48
Q

Thin filaments slide past thick filaments and penetrate more deeply into the A band, which remains constant in length

A

HUXLEY’S SLIDING-FILAMENT MODEL

49
Q

I and H bands shorten as Z disks are drawn closer together

A

HUXLEY’S SLIDING-FILAMENT MODEL

Histology (37 decks)

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