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(a) Identify figures A and B. (b) Label X, Y and Z. (c) Which one act as impulse booster ? (d) Which one is under control our will ?

Answer» (a) Figure A is cardiac muscle fibres.
Figure B is skeletal or striated muscle fibres.
(b) X-Intercalated disc, Y-light band, Z-Dark band
(c) Intercalated disc act as and impulse booster.
(d) Skeletal or striated muscle is under control of our will


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