In the thin filament of skeletal muscle fibre,a small globular protein that masks the active sites for myosin on the $F-$actin,is

Identify the characteristics of red muscle fibers from the following:
$I -$ Many mitochondria
$II -$ Use large amounts of $O_2$ for $ATP$ production
$III -$ Low amount of myoglobin
$IV -$ Less sarcoplasmic reticulum
Which of the above are characteristic of red muscle fibers?

The structural and functional unit of myofibril which contracts to cause movement is called

In a skeletal muscle fiber,how many actin filaments surround each myosin filament?

Short duration contractions are characteristic of:

Give information regarding characteristics of muscles and its types.