Answer :
Using the data correctly to justify the claim that the phosphagen system is the immediate and short-term source of ATP in muscle cells is the figure that indicates that ATP production by the phosphagen system increases and decreases rapidly following the start of the exercise period.
What is ATP?
Adenosine triphosphate (ATP) is a cellular energy source for use and storage. An adenine-based nitrogenous base, a ribose sugar, and three consecutive phosphate groups form the nucleoside triphosphate structure of ATP. ATP is an important part of the process when macromolecules such as proteins and lipids move in and out of cells. Active transport mechanisms can move these molecules across concentration gradients, as hydrolysis of ATP provides the necessary energy. The energy source for cells is ATP. Cells can safely store energy in small packets and release it only when absolutely necessary. In other words, ATP bridges the gap between energy-requiring activities, such as synthesis, and energy-releasing activities, such as food breakdown.
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