When there is a drop in the force of contraction after prolonged stimulation,it is known as

Which ions must be present for the binding of cross-bridges during muscle contraction?

Skeletal muscles are closely associated with the $...A...$ components of the body. They have $... B...$ appearance under the microscope and hence are called $...C...$ muscles.
Choose the correct options to fill $A, B$ and $C$,so as to complete the given $NCERT$ statement.

Give information regarding characteristics of muscles and its types.

Match the following columns:

Column-$I$	Column-$II$
$P$. Skeletal muscle	$I$. Biceps
$Q$. Smooth muscle	$II$. Iris
$R$. Cardiac muscle	$III$. Heart

Each myofibril of a muscle contains: