How does a motor neuron work when a mosquito is seen on an arm? it receives stimuli information from the skin and sends it to the brain where it is processed. it receives processed information from the brain, causing the muscles of the arm and hands to remove the mosquito from the arm. it processes information from the stimuli receiver and makes the brain aware that there is a mosquito on the arm. it makes the arm numb from the effect of the mosquito bite.

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.