Another action potential can be produced, but only if the stimulus is greater than the threshold stimulus. 1  corresponds to the period when the potassium channels are open (several milliseconds) 2  the nerve cell membrane becomes progressively more 'sensitive' (easier to stimulate) as the relative refractory period proceeds.
According to the International Banana Association, an average-sized banana weighs 120 grams. I'm assuming this does not include the peel because the discussion is in the context of nutritional information. + 78 others found this useful.
A average-size banana contains 500 mg. of potassium; If we need 5000 mgs per day, then about 10 would be ideal if that is our only PO source. But you never get caught up, as #2 explained; bananas are wonderfull food, one of few that a person can eat only that and survive.