MCQ
In man artificial pacemaker is implanted due to defects in
- ✓$SA$ node
- B$AV$ node
- CMitral valve
- DPurkinje fibres
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$I.$ Myosin head binds to the exposed active site on action to form a cross bridge
$II.$ The Z-line attached to these actin are also pulled in wards there by causing shortening of sarcomere also called contraction
$III.$ This pulls the attached actin filaments towards the centre of $A$-band The correct option is
$(A)$ semiautonomous organelles
$(B)$ formed by division of preexisting organelles and they contain $DNA$ but lack protein synthesising machinery.
Which one of the following options is correct ?