Go through the following statements
During muscle contraction, the width of A-band remains constant while I-band shortens.
During muscle contraction, the `Ca^(2+)` released from the SR bind to the troponin component of thin filament
The process of muscle contraction is faster in smooth muscle as they have a well developed sarcoplasmic reticulum.
The red muscle fibres have abundant mitochondria, low glycogen and poorly formed sarcoplasmic reticulum.