24. When given an image of a cardiac contractile cell, such as the one belo describe the steps that occur during excitation-contraction coupling (the "before op 1" step show with the squiggly red arrow below), contraction (steps 1-6 below) AND relaxation (steps 7-10 belowl). Be sure to fully describe the role of Ca*2 ATPase and Na Ca+2 exchanger (NCX) in steps 9 and 101 ECF ICF SR Ca2+ RyR 1. Ca sparks Ca signal Contraction Ltype Ca channel 2 K ATP ATP 3 Na 3 Nat Ca Sarcoplasmic reticulum (SR) Cal stores TALL NCX Relaxation Ca2+ oe FI Actin Myosin

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