Skeletal Structure and Muscle Filaments — NEET Biology
📚 Practice ConceptWrite true or false. If false change the statement so that it is true. (a) Actin is present in thin filament (b) H-zone of striated muscle fibre represents both thick and thin filaments. (c) Human skeleton has 206 bones. (d) There are 11 pairs of ribs in man. (e) Sternum is present on the ventral side of the body.
Which of the following statements about muscle structure and protein function are correct? S1: Each 'F' actin filament, a polymer of monomeric 'G' actins, is associated with two helical tropomyosin filaments that run throughout its length. S2: The heavy meromyosin (HMM) component, which includes the globular head and a short arm, projects outwards as the cross arm and has an active ATPase enzyme activity. S3: Troponin is a complex protein distributed at regular intervals on the F-actin filament, masking the myosin binding sites in a resting muscle. S4: The Z-line is an elastic fibre that bisects the 'I' band and serves as the anchoring point for the thick filaments. S5: In a resting state, the 'H' zone represents the central part of the 'A' band where the thick filaments are partially overlapped by the thin filaments.
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