Question

Sliding filament theory can be best explained as

• A. actin and myosin filaments do not shorten but rather slide pass each other
• B. when myofilaments slide pass each other, myosin filaments shorten while actin filaments do not shorten
• C. when myofilaments slide pass each other actin filaments shorten while myosin filaments do not shorten
• D. actin and myosin filaments shorten and slide pass each other.

Answer 1

Answer: (A)

∙ For a muscle to contract, thick and thin filaments of sarcomeres do not shorten instead they slide by one another, causing the sarcomere to shorten while the filaments remain the same length.
∙ Muscular contraction Is the shortening of myofibrils in response to nervous stimulation and during this actin filament slides over myosin filament and links with them, resulting in information actomyosin complexes.
∙ The distance between the Z lines is reduced when a muscle contracts.
∙ The H zone contains only thick filaments and the I band contains only thin filaments is shortened during contraction
∙ The A band does not shorten and remains the same length.