The functional unit of the contractile system for a striated muscle is:

In which condition does relaxation occur in muscles?

Which one of the following takes place in a myofibril when skeletal muscle contracts?
$A$-band (Dark band) | $I$-band (Light band) | $H$-zone

Contractile proteins are found in

Identify the odd one out from the following list.

The contractile protein of skeletal muscle involving ATPase activity is