Dynamic vs static equilibrium in terms of ATP usage

[Astra]

Which uses ATP and why?

Thanks a lot!

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[NextStepTutor_2]

Which uses ATP and why?

Thanks a lot!

Are you referring to a chemical or physics context? Both are similar but I assume chemical since you mention ATP. The main difference between static and dynamic equilibrium can be identified as the motion of productions and reactions.

Dynamic: Imagine that reaction has only reactants to start with. Reactants will react to each other and produce the products. As the concentration of the reactants is higher at the beginning, more reactants will be converted into products. However, as the number of product molecules increases, the products will start to break into the reactant molecules again. But since the number of product molecules is fewer than the number of reactant molecules, the rate of reactants being converted into products is higher than the rate of products being converted back into reactants. The process of the conversion of reactants into products is generally known as the forward reaction, and the process of the conversion of the products into reactants is known as the backward reaction. Basically, in a dynamic equilibrium, both forward and backward reactions occur at the same rate even though it is perceived that the number of products and of reactants remain unchanged.

In static equilibrium, as in a dynamic equilibrium, the number of reactants and the number of products remain the same. However, the reactions itself has come to a halt without any more reactants converting into products and vice versa. This gives the idea of a static condition as the name implies. For example, imagine that reaction started with several reactant molecules and few product molecules. After some time, the reaction will come to a halt. This means that the composition remained the same actually without any interchanges within the mixture.

Generally, irreversible reactions can be considered as a sort of static equilibrium, as there is no further change taking place within the system. However, this scenario has more meaning when applied in a mechanical sense rather than a chemical one.

As far as ATP, I would think you could have ATP usage in both cases, though in the human body is more common to have dynamic equilibrium since our entire body is usually trying to maintain homeostasis in one way or another. ATP usage is probably more prevalent/like in dynamic equilibrium since static equilibrium implies there are no real actions taking place within the system.