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What is the role of sarcoplasmic reticulum myosin head and F-actin during contraction of striated muscles of hormones.

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(i) Sarcoplasmic reticulum: It releases calcium ions into the sarcoplasm that binds to troponin causing a change in its shape and position and thereby remove the masking of active sites for myosin. 

(ii) Myosin head: The myosin head is an active ATPase enzyme and has binding sites for ATP and active sites for actin. It binds to the exposed active sites on actin to form a cross bridge. 

(iii) F-actin: The actin sites on the F-actin are specific to the mysoin head for cross-bridge formation.

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