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At full muscle contraction the Z-lines a...

At full muscle contraction the Z-lines attached to thin filaments are almost touching

A

A-band

B

I-band

C

Actin fibres

D

H-zone.

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The correct Answer is:
A
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The given graph shows length-tension curve for a typical vertebrate sarcomere. By analysing the graph, what can you deduce regarding the muscle contraction? (i) Neither the myosin filaments nor the actin thin filaments change in length when a sarcomere shortens or is stretched. Instead, it is the extent of ocerlap between actin and myosin filaments that changes. (ii) The total tension produced by a sarcomere is proportional to the total number of cross-bridges that can interact with actin filaments, and this number in turn is proportional to the amount of of overlap between thick and thin filaments. (iii) The tension produced by the muscle is maximal when the overlap between thick and thin filamentss allows the largest number of myosin cross-bridges to bind to actin. (iv) Tension drops off with increased lenght, because the thick and thin filaments overlap less and fewer cross-bridges can bind. Tension drops off with decreased length, because thin filaments at the two ends of the secromere begin to collide with each other, preventing further shortening.

Assertion: Mechanism of muscle contraction is expalained by sliding-filaments theory. Reason: Contraction of muscle fibre takes place by the sliding of thick filaments over the thin filaments.

According to sliding filament theory of muscle contraction, the filament that move to shorten a muscle are

In which cateory of muscle of muscle contraction the filament that move to shorten a muscle are

During contraction of muscles Ca^(2+) attaches to

Read the following statements is context to muscle tissue and choose the correct answer . (i) Excessive exercise results in anaerobic Respiration and forms lactic acid . (ii) As per sliding filament theory of muscle contraction, the filament that moves to shorten a muscule is actin . (iii) The muscles primarily involved in locomotion is striated muscles .

Assertion : Contraction of a muscle fibre takes place by the sliding of the thin filaments over the thick filaments. Reason : The central part of thick filament is not overlapped by thin filaments in a resting state.

Mechanism OF Muscle Contraction || Sliding Filament Theory

DINESH PUBLICATION-LOCOMOTION AND MOVEMENT-REVISION QUESTIONS FROM COMPETITIVE EXAMS.
  1. Name the bone which is not attached to any other bone in human body

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  2. The amoeboid movements result from

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  3. At full muscle contraction the Z-lines attached to thin filaments are ...

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  4. Inflammation of synovial membrane produces

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  5. Contraction cycle of muscle showing parts of muscle twitch is given. F...

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  6. Most of the cartilages in vertebrate embryo are replaced in adult by

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  7. Gliding joint is present between

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  8. Which one of the following secretes a watery fluid for lubricating and...

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  9. The flight muscles in an eagle has more of aerobic muscles. These musc...

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  10. Which of the following joints would allow no movement

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  11. Which is not a function of skeletal system

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  12. Label the correct part of myosin monomer <img src="https://d10lpgp6x...

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  13. Which one is not cranial bone

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  14. State the condition of muscle contraction in following diagram

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  15. The contractile regulatory proteins that mask and unmask active sites ...

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  16. Choose the wrong match with reference to joits

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  17. Osteoid refers to

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  18. How many type of synovial joints are there.

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  19. The ball and socket type of joint is also called

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  20. Cross bridges of sarcomere in skeletal muscle are made up of

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