Muscle Characteristics Flashcards

1
Q

What causes contractions and shortening of muscles

A

Movement of microfilaments

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2
Q

Encloses a single muscle fiber

A

Endomysium

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3
Q

Wraps around a fascicle of muscle fibers

A

Perimysium

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4
Q

Covers the entire skeletal muscle

A

Epimysium

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5
Q

On the outside of the epimysium

A

Fascia

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6
Q

What can the epimysium blend into

A

Tendons or aponeuroses

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7
Q

What are tendons made of

A

Collagen fibers

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8
Q

Why do tendons cross joints

A

Toughness and small size

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9
Q

What are tendons

A

Cord like structures that attach muscle to bone

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10
Q

What are aponeuroses

A

Sheet like structures that attach muscles indirectly

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11
Q

Four basic functions of muscles

A

Produce movement
Maintain posture
Stabilize joint
Generate heat

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12
Q

All movement come from what

A

Muscle contraction

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13
Q

To maintain posture what occurs

A

Tiny adjustments are being made constantly

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14
Q

ATP uses energy to make muscles contract and how much of that is released as heat

A

3/4

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15
Q

Skeletal muscles account for how much of the body mass

A

20%

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16
Q

What type of muscle generate s the most heat

17
Q

Specialized plasma membrane

A

Sacrolemma

18
Q

Long organelles inside muscle cells

A

Myofibrils

19
Q

Specialized smooth endoplasmic reticulum

A

Sacroplasmic reticulum

20
Q

What do Myofibrils look like

A

They are aligned in a way that makes them look banded

21
Q

I band

A

Light band

22
Q

I band contains what

A

Thin filaments

23
Q

A band

24
Q

Dark bands contain what

A

Thick filaments

25
Contractile unit of a muscle fiber
Sarcomere
26
Thick filaments
Myosin
27
Thin filaments
Actin
28
What are thin filaments attached to
Z discs
29
What is special about thick filaments
Have heads
30
What is the h zone or bare zone
Area where ther is no actin filaments
31
What is the function of the SR
Stores and releases calcium
32
Location of the SR
Surrounds the Myofibrils
33
Other name for a muscle cell
Muscle fiber