For the following true-false questions, mark \"A\" for true and \"B\" for false

Question

For the following true-false questions, mark "A" for true and "B" for false 66) Transverse tubules allow nutrients to be dispersed throughout very large muscle cells. 67) Skeletal muscle fibers have only one nucleus per cell 68) Muscle twitch occurs when only a few muscle cells in the entire muscle are fully contracted 69) Slow oxidative fibers have poor strength but excellent endurance 70) Muscles can lengthen under their own power as well as contract 71) Extensibility is not a feature of muscle tissue 72) Tetanus is the recruitment of additional fibers during muscle contraction 73) The term "sarco" refers to larger scale bone structure and organs 74) Human muscle cells may produce lactic acid when they run out of oxygen 75) Titin has a molecular weight of around 25000 Daltons 76) G-Actin polymerizes to form F-Actin. 77) Thin filaments are composed exclusively of the protein Mvosin 78) Each thin filament consists of about 250 Myosin molecules 79) The power stroke is generated during the latent phase 80) Reformation of cross bridges occurs during the contraction- relaxation phase 81) Creatine phosphate (phosphocreatine) carries extra oxygen in slow oxidative fibers 82) Myosin gives fast oxidative fibers their characteristic color.

Explanation / Answer

Ans.66. A

It is TRUE. T-tubules (Transverse tubules) penetrate into the sarcolemma and helps in transport of nutrients in and out of the cells.

Ans.67. B

It is FALSE. Skeletal muscles are multinucleated where as smooth muscles have single nucleus.

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