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

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.

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Sarcloplasmic reticulum is the store house of ca ions in the cell which when released into the sarcoplasm bind with a subunit of troponin on actin filaments thereby removing the masking of active sites for myosin.Utilising energy the myosin head binds to the active sites to form a cross bridge.the actin filaments are pulled towards the centre of A band.The Z line attached to the actins is also pulled inwards causing a contraction.

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