The distance or length of the myofibril between two adjacent $Z$-bands is called

'Gastrocnemius' is a muscle of

The triceps muscle connects the ulna with which of the following bones?

Mainly,skeletal muscles are named on the basis of:

The largest smooth muscle is present in:

Select the correct option for the following statements:
$(i)$ The most important respiratory organ in frogs is the skin / lungs.
(ii) Skeletal muscle / Cardiac muscle exhibits rhythmic contraction.