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Myology Muscle Physiology > Myology > Flashcards

Myology Flashcards

0
Q

Striated cardiac muscle

A

Stacked end to end
Involuntary muscle
Found in the heart
Too specialized to divide

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1
Q

Non-striated (smooth muscle)

A

Short, spindle -shaped cells
Involuntary muscle-no control
Cells can divide
Found in organs

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2
Q

Striated skeletal muscle

A

One multinucleated cell
Voluntary muscle
Cannot repair itself

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3
Q

Function of muscle tissue

A

Movement
Support and maintain posture
Heat production

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4
Q

Muscle belly

A

Vascular, reddish or meat-like appearance,

Lots of blood and cells,

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5
Q

Tendons

A

Avascular, tough, white, college fibers muscle to bone

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6
Q

Attachments

A

Origin-fixed end: least mobile during muscle contraction. Closer to midline
Shoulder

Insertion- mobile end: more movement during muscle contraction, further from the midline

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7
Q

Muscle cells myofibril

A

Striated skeletal myocyte- muscle cell or fiber

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8
Q

Endomysium

A

Loose connective tissue

Wrapping around Twinkie

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9
Q

Perimysium

A

Dense irregular connective tissue

Box

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10
Q

Epimysium

A

Dense irregular connective tissue

Crate

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11
Q

Facia

A

Dense irregular connective tissue

Big strong wrapping paper

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12
Q

The predominant structural feature of the muscle fiber is the presence of numerous ______

A

Myofibrils

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13
Q

Thick filament

A

Molecular motors

Myosin

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14
Q

Thin filament

A

Binding sites

Actin

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15
Q

Troponin-tropomyosin complex

A

Door. Wraps around thin

16
Q

Sarcomere

A

Contraction between to z discs

17
Q

Contraction

A

Thin gets pulled in together

18
Q

Motor unit

A

Motor neuron and muscle cell

19
Q

Motor neurons tell..

A

Muscle when to release calcium, which will loosen the tt- complex which then the thick can attach to the thin

20
Q

Mechanics of muscle contraction (4)

A
  1. Relaxed state- thick is not attached to thin receptor cites are blocked
  2. Attachment- calcium enters tt- complex loosens myosin (thick) attaches
  3. Power stroke- bind and pull moves thin closer together
  4. Release and reset- ATP is released to reset myosin, tt-c binds back around thin myosin(thick) cannot attach
21
Q

Without binding there is….

A

No movement

22
Q

When ATP comes in ….

A

Calcium goes out

Myology Muscle Physiology (1 decks)

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