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Lower extremity > Histology of Muscles > Flashcards

Histology of Muscles Flashcards

1
Q

Represents thick filaments held in register at the center of the sarcomere

A

M-line

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2
Q

Type of muscle fiber is found in muscles involved in sustaining posture or upright position?

A

Type I

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3
Q

Connective tissue surrounding each muscle bundle

A

Epimesium

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4
Q

Connective tissue surrounding each muscle fascicle

A

Perimesium

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5
Q

Connective tissue surrounding each muscle fiber

A

Endomesium

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6
Q

A bundle of muscle fibers

A

Muscle fascicle

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7
Q

A bundle of myofibrils

A

Muscle fiber

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8
Q

A bundle of myofilaments

A

Myofibril

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9
Q

Basic contractile unit found between two adjacent Z-lines

A

Sarcomere

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10
Q

Types of myofilaments

A

Thick (myosin) and thin (actin) filaments

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11
Q

Visceral striated muscles are morphologically similar to skeletal muscles. T/F

A

T

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12
Q

Types of muscle according to appearance of contractile cells

A

Striated muscle and smooth muscle

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13
Q

Types of skeletal muscle fibers

A

Type I / slow oxidative/ red, Type IIa/ fast oxidative glycolytic/ intermediate, Type IIb/ fast glycolytic/ white

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14
Q

Type I and Type IIb fibers have high numbers of mitochondria. T/F

A

F

Type I and Type IIa have. Type IIb has less.

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15
Q

Type IIa and Type IIb fibers have high amounts of myoglobin. T/F

A

F

Type I and Type IIa have. Type IIb has less.

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16
Q

Type IIa fibers are fatigue-prone. T/F

A

F

Type IIb is. Type IIa and type I are fatigue-resistant.

17
Q

High percentage of muscle type in marathon runners

A

Type I/ slow oxidative

18
Q

High percentage of muscle type in middle distance swimmers and hockey players

A

Type IIa/ fast oxidative glycolytic

19
Q

High percentage muscle type in short distance sprinters and weight lifters

A

Type IIIa/ fast glycolytic

20
Q

Muscle fibers that produce lactic acid

A

Type IIa, Type IIb

21
Q

Muscle fibers that store glycogen

A

Type IIa, Type IIb

22
Q

Which type of muscles are the long muscles of the back?

A

Type I

23
Q

Which type of muscles are the muscles of the digits?

A

Type IIb

24
Q

Term for the smooth ER of muscle cells

A

Sarcoplasmic reticulum

25
Q

Muscle fibers are connective tissue. T/F

A

F

They are muscle cells.

26
Q

The contractile elements of striated muscles

A

Myofilaments

27
Q

Birefringent dark bands of muscle fibers

A

A bands (anisotropic)

28
Q

Monorefrigent light bands of muscle fibers

A

I bands (isotropic)

29
Q

The dense line that bisects the I band

A

Z line/ Z disc

30
Q

The light region that bisects the A band

A

H band

31
Q

The narrow dense line that bisects the H band

A

M line

Lower extremity (5 decks)

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