F2 Muscle structure Flashcards

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1
Q

Sarcolemma

A

Membrane of muscle cell

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2
Q

Sarcoplasm

A

Cytoplasm of muscle cell

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3
Q

Sarcoplasmic reticulum

A

Smooth ER of muscle cell

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4
Q

Myofibrilis

A

Major unit of muscle cell, ca 80%,

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5
Q

Myofilaments

A

Vad fibrillerna består av.

Finns 3, thin, thich och elastiskt

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6
Q

Thick filaments

A

Myosin, viktigaste proteinet.

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7
Q

Thin filaments

A

Actin, troponin, tropomyosin, CapZ, tropomodulin, viktigaste proteinerna

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8
Q

Elastic filament

A

Titin, nibulin, alfa-actin, viktigaste proteinerna.

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9
Q

Sarcoplasmic proteins

A

Hemoglobin och myoglobin (viktigaste), finns över 100 st, mest små, lågmolekylära.

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10
Q

Connective tissue

A

Kollagen (20-25% av total body protein)

Elastin - elastiskt

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11
Q

Beskriv mekanismen bakom en muskelkontraktion.

Sliding filaments

A
  1. Nervsignal via T-tubule
  2. Sarcoplasmic reticulum släpper Ca++
  3. Calcium binder till troponin C.
  4. Troponinkomplexet släpper bindningen till actin.
  5. Actin binder till myosin på active site
  6. ATP används som energi
  7. Thick and thin elements can slide over eachother
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