Muscle cells store enough atp and phosphocreatine for about of exercise.

The correct option is 15 seconds.

Explanation:

At the time of exercise, our muscles contract rapidly. The contraction of the muscles is a phenomenon which occurs from the energy source ATP.

There are four sources of obtaining ATP at the time of muscle contraction. One of this source is phosphocreatine.

The phosphocreatine can create ATP for 15 seconds after the muscles start to contract. Phosphocreatine has the ability to donate a phosphate group to ADP to produce ATP.

not sure if this is what you'r looking for nnew= nold

question: which statement best describes the different properties of metals?

answer: they are shiny and bend without breaking.

since metals have certain characteristics properties, they include the following: they are ductile, malleable, shiny, hard, lustrous, flexible and they are good conductor of heat and electricity. so therefore, metals are not dull and they are not non-flexible as listed. instead, they are shiny and flexible.

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