Final answer:
The body does not need to put in any more energy once the substrate has reached its transition state because the transition state is stabilized by the enzyme, reducing the need for extra energy.
Step-by-step explanation:
The body does not need to put in any more energy once the substrate has reached its transition state because the transition state is stabilized by the enzyme, reducing the need for extra energy. Enzymes lower the activation energy of a reaction by contorting substrate molecules and facilitating bond-breaking, helping to reach the transition state. Enzymes can also lower activation energies by taking part in the chemical reaction itself. After an enzyme has catalyzed a reaction, it releases its product(s) and can catalyze another reaction.