Muscle Contraction Muscle structure Actin and myosin filaments

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Muscle Contraction Muscle structure Actin and myosin filaments Sliding filament theory

Muscle fibres and myofibrils Skeletal muscle fibres are Multinucleate They contain specialized endoplasmic reticulum called “sarcoplasmic reticulum”. Muscle fibres contain many myofibrils. Each myofibril is made up of contractile sarcomeres. “SkeletalMuscle" by BruceBlaus. Wikiversity Journal of Medicine. - CC BY 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Blausen_0801_SkeletalMuscle.png#mediaviewer/File:Blausen_0801_SkeletalMuscle.png

Sarcomeres contain thick myosin and thin actin filaments

Myosin and Actin filament Image – public domain by Häggström, Mikael. "Medical gallery of Mikael Häggström 2014". Wikiversity

The sliding filament theory of muscle contraction When a muscle contracts, the actin is pulled along myosin toward the centre of the sarcomere. The actin and myosin filaments become completely overlapping. There is no pale area in the centre. The muscle shortens. Note: The actin & myosin filaments don’t change length, they just slide past each other.

Sliding filament theory Z line Z line Z line Z line