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if you run as fast as you can, your muscles may begin to feel weak and have a burning sensation. explain what is occuring in your muscle cells that accounts for this muscle fatigue.

a.) inadequate supply of glucose to muscle cells leads to alcohol fermentation

b.) excessive supply of oxygen to muscle cells leads to mitochondrial autolysis

c.) excessive supply of atp to muscle cells leads to hypertonic conditions

d.) inadequate supply of oxygen to muscle cells leads to lactic acid fermentation

At this stage muscles used up oxygen and can't get more fast enough so, they go through lactic acid fermentation. The muscle builds up lactic acid fermentation makes the muscle fatigue

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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human didn't come from monkeys man i hate these stupid teachers