Question

The functional unit of contractile system of a
striated muscle is
(a) sarcomere (b) Z-band
(c) cross bridge (d) myofibril

Answer 1

Answer:

Skeletal muscles are composed of striated subunits, called as sarcomeres, which are composed of the myofilaments actin and myosin. Sarcomeres are repeating subunits of thin and thick protein fibers within myofibrils, from one Z line to the next Z line.

Hence, option C is correct.

Answer 2

Answer:

The functional unit of contractile system of a

striated muscle is

(a) sarcomere ✔

(b) Z-band

(c) cross bridge

(d) myofibril