Read the following statements and choose the correct option:
(i) During muscle contraction, chemical energy is converted into mechanical energy.
(ii) Both actin and myosin are present in A-band.
(iii) Only myosin is present in H-zone.
(iv) Muscular tissue is endodermal in origin.
(ii) Both actin and myosin are present in A-band.
(iii) Only myosin is present in H-zone.
(iv) Muscular tissue is endodermal in origin.
Important Questions on Locomotion and Movement
In the given diagram, which joints are found at the marked sites:
(i) Cardiac fibres are branched with one or more nuclei.
(ii) Smooth muscles are unbranched and cylindrical.
(iii) Skeletal muscles can be branched or unbranched.
(iv) Smooth muscles are non-striated.
Fill in the blanks with correct options:
Fill in the blanks with correct options:
(i) Each actin (thin) filament is made of ________ I ________ 'F' (filamentous) actins helically wound to each other.
(ii) Two filaments of another protein_______ II _______ also run close to 'F' actins throughout their length.
(iii) In the resting state, a subunit of troponin masks the active binding sites for________III________ on _________ IV _______ filaments.
