Which option correctly describes the nature of nerve signals?

nerve signals are electrical. they move along nerve cells from the point of contact to the spinal cord and then to the heart.
nerve signals are electrical. they move along nerve cells from the point of contact to the spinal cord and then to the brain.
nerve signals are mechanical. they move along nerve cells from the point of contact to the spinal cord and then to the heart.
nerve signals are mechanical. they move along nerve cells from the point of contact to the spinal cord and then to the brain.

The right answer is c.sandstone.

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.

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Go into your kitchen and get some water or coolaid and warm up at hot dog