NEET 2015 Biology question

Sliding filament theory can be best explained as :-

(1)Actin and Myosin filaments shorten and slide pass each other
(2)Actin and Myosin filaments do not shorten but rather slide pass each otherCorrect
(3)When myofilaments slide pass each other, Myosin filaments shorten while Actin filaments do not shorten
(4)When myofilaments slide pass each other Actin filaments shorten while Myosin filament do not shorten

Answer: (2)

Solution

According to the sliding filament theory, muscle contraction occurs when the thin (actin) filaments are pulled inwards over the thick (myosin) filaments by the cross-bridges. Neither filament changes its length; the sarcomere shortens

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Question ID VK-091712