In the context of blood pressure measurements, represents the pressure within the arterial system when the heart is resting and filling with blood.

The numerator in the fraction of the blood pressure measurement is called the systolic blood pressure which is the gauge of the amount pressure your blood is exerting against your artery walls when your heart pumps blood. The denominator is, on the other hand, called diastolic pressure which is the pressure your blood is exerting against your artery walls while the heart is resting between beats. Answer is the diastolic pressure. 
 

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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