Spiercontractie Flashcards

1
Q

2 soorten spieren

A

Gladde spieren en dwarsgestreepte spieren

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2
Q

5 ‘states’ van cross bridge cycle

A
  1. Attached state
  2. Released state
  3. Cocked state
  4. Crossbridge state
  5. Powerstroke state
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3
Q

Attached state

A

Myosinekopje aan actinefilament

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4
Q

Released state

A

ATP aan myosinekopje en myosine kopje laat los van actinefilament

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5
Q

Cocked state

A

ATP wordt ADP
Vrijgekomen energie zorgt voor conformatie van myosinekopje

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6
Q

Crossbridge state

A

Myosinekopje bindt stukje verder op aan actine

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7
Q

Powerstroke state

A

Afgesplitste fosfaatgroep van ATP komt los van myosinekopje, waardoor kopje terug komt in conformatie van attached state en myosine verplaatst wordt ten opzichte van actine.

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8
Q

Rigor mortis

A

stijfheid spieren na overlijden.
Door gebrek ATP blijven myosinekopjes in attached state.

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9
Q

Tropomyosine

A

eiwitstreng om actine filament

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10
Q

isometrische contractie

A

lengte spier blijft hetzelfde, maar er ontstaat hoge spanning in spier

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11
Q

isotone contractie

A

Verkorting van de spier

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12
Q

Functies skelet voor spieren

A

beperkt bewegingsruimte van spier
Zorgt dat spieren rond rustlengte blijven zodat ze optimaal kracht kunnen genereren

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13
Q

Type I spiervezels

A

Langzaam, maar onvermoeibaar
Goede zuurstoftoevoer
Lichaamshouding

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14
Q

Type IIa spiervezels

A

meer kracht en sneller dan type I
vermoeibaar

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15
Q

Type IIb

A

zeer snel
snel vermoeibaar

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