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the stages of the sliding filament theory of contraction

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by

Elizabeth Owens

on 1 February 2015

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Transcript of the stages of the sliding filament theory of contraction

In the first stage of the sliding filament theory of contraction, calcium ions are released by sarcoplasmic reticulum into the sarcoplasm.
stage 1
the stages of the sliding filament theory of contraction
In the second stage of the sliding filament theory of contraction, the breakdown of ATP releases energy, releasing the head of the myosin.
stage 2
In the third stage of the sliding filament theory of contraction, calcium ions bind to troponin, exposing the binding site on the actin filament.
stage 3
In the fourth stage of the sliding filament theory of contraction, the myosin head attaches to the exposed binding site on the actin filament, forming a cross bridge.
stage 4
In the fifth stage of the sliding filament theory of contraction, the flexing of the cross bridge pulls the actin filamet toward the center of the sarcomere.
stage 5
In the sixth stage of the sliding filament theory of contraction, an ATP molecule reattaches to the ATP binding site on the mytosin head.
stage 6
In the seventh stage of the sliding filament theory of contraction, the mytosin head is released from the actin filament's binding site and the binding site is covered up again.
stage 7
In the eighth and final stage of the sliding filament theory of contraction, with the ATP molecule in place on the mytosin head and calcium ions present, the cycle can continue.
stage 8
ATP stands for adenosine triphosphate.

Myosin strands have golf-club shaped objects called heads attached to them. They are located at the center of a sarcomere and together with actin strands, they form the contractional filaments of muscles..

Actin strands are thinner proteins and surround the thicker myosin strand in the sarcomere. The actual number of actin strands encircling myosin depends upon the specific muscle. Larger muscles would have more, and smaller muscles would have fewer.
by: Elizabeth Owens
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