Question
‘Dengue fever' is caused by
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Identify structures $A$ to $D$.
$A$. Muscle bundles are held together by collagenous connective tissue layer called fascicle.
$B$. Sarcoplasmic reticulum of muscle fibre is a store house of calcium ions.
$C$. Striated appearance of skeletal muscle fibre is due to distribution pattern of actin and myosin proteins.
$D$. $M$ line is considered as functional unit of contraction called sarcomere.
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