The phenomena known as "treppe" appears to violate the "all-or-none" law in which the strength by which the myofiber responds to a stimulus is independent of the strength of the stimulus as long as the stimulus strength is greater than the threshold potential. in other words, if the stimulus strength is great enough to open voltage-gated channels for na+ and k+ in the sarcolemma, the myofiber will contract with the same force even if the stimulus strength (voltage) is greater. which of the following explains the seemingly contradictory behavior of a muscle cell demonstrating "treppe" o
(a) with repeated contractile response to a minimum threshold stimulus, the ion channels become more effective in the movement of ions across the plasma membrane
b. with repeated contractile response to a minimum threshold stimulus, the myosin atpase enzymes become more efficient
(c) a substantial increase in the cytoplasmic ca++ concentration since there is insufficient time for ca++ reuptake by the sarcoplasmic reticulum
(d) a and b
(e) a and c