Birefringence experiments on isolated skeletal muscle fibres suggest a possible signal from the sarcoplasmic reticulum.
D000200:Action Potentials; D000818:Animals; D001718:Birefringence; D002118:Calcium / Q000378:metabolism; D066298:In Vitro Techniques; D008564:Membrane Potentials; D009119:Muscle Contraction; D009132:Muscles / Q000378:metabolism / Q000502:physiology*; D011896:Rana temporaria; D012519:Sarcoplasmic Reticulum / Q000502:physiology*
D002118:Calcium