Where does the atp used during the atp-pcr and glycolysis systems come from?

ATP-Pcr System also known as an immediate energy system. The ATP- PCr system is the key energy source for a high-intensity, short-lived exercise of up to 10 seconds, such as  swinginging a golf club, weight lifting, throwing a hammer, and pushing.

Glycolysis is the breakdown of glucose (C6H12O6 ) into pyruvate (CH3COCOO−) and H+ and releases free energy in order to to form ATP and NADH molecules.

ATP (adenosine triphosphate) is the stored source of energy readily available to the body when it interacts with water to generate heat and energy.

ATP is the body's primary energy source which hydrolyzed to releases lot of energy  which results in protein synthesis and muscle contraction.

Hence, ATP is stored in body utilised during atp-pcr and glycolysis systems.

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a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.