Question

what is role of ca++ ion in muscle contraction

Answer 1

In turn this triggers the sarcoplasmic reticulum to release calcium ions into themuscle interior where they bind to troponin, thus causing tropomyosin to shift from the face of the actin filament to which myosin heads need to bind to producecontraction.

Answer 2

In turn this triggers the sarcoplasmic reticulum to release calcium ions into the muscle interior where they bind to troponin, thus causing tropomyosin to shift from the face of the actin filament to which myosin heads need to bind to produce contraction. ... This is the steric blocking mechanism of muscle regulation.