Resting membrane potential: channels are closed (inactivation na gates are open, no ion-gated channels open only leak channels stimulus)

2) depolarization: na+ activation gates open, threshold is reached -55mv, sodium flows in, positive feedback loop (more depolarization, more gates opening, more na+ flowing in all the way to about +35mv)

3) repolarization: peak happens because the na+ inactivation gates are fully closed, k+ channels then open

4) hyperpolarization: na+ activation gates close below threshold, k+ gates are still open, too much k+ flows out of cell because the gate is slow, making rmp too low
-- k+ ion absorbed by astrocytes on outside to reset the charges to about -70mv as well as the sodium potassium pump bringing back the maintaining chemical gradient by throwing out na+ and bringing k+ back in

Starch and are common polysaccharide carbohydrates found in plants. sucrose glycogen fructose cellulose

How many liters of hydrogen gas will be produced at stp from the reaction of 7.179×10^23 atoms of magnesium with 54.219g of phosphoric acid (h3po4) the equation is 3mg + 2h3(> mg(po4)2+3h2

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes.which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature.sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent