Sliding filament theory can be best explained as

When myofilaments slide pass each other actin filaments shorten while myosin filament does not shorten

Actin-myosin filaments shorten and slide pass each other

Actin and myosin filaments do not shorten, but rather slide pass each other

When myofilament slide passes each other myosin filament shorten while actin filament do not shorten.

Solution

Actin-myosin filaments shorten and slide pass each other

According to sliding filament theory, during muscle contraction actin and myosin filaments shorter and slide pass each other.

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