Question

What is the role of sarcoplasmic reticulum,myosin head and F-actin during contraction of striated muscle of humans?

Answer 1

The sarcoplasmic reticulum releases calcium ions which are required by various enzymes during muscle contraction.
The myosin heads perform the task of attachment and detachment extending from the heads on the myosin filaments to the sites on actin filaments.
The F actin acts as a generator of tension by binding with myosin and forming a complex for muscle contraction.