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The energy needed for muscular effort is released during what process?

  1. Metabolism

  2. Catabolism

  3. Photosynthesis

  4. Digestion

The correct answer is: Catabolism

This option is incorrect because catabolism refers to the breaking down of molecules, which does not release energy for muscular effort. Metabolism is also incorrect because it is a broad term that encompasses both anabolic and catabolic processes. Photosynthesis is incorrect because it is a process used by plants to produce energy, not humans. Digestion is also incorrect because it involves breaking down food, but the energy released is used for other bodily functions, not just muscular effort. Muscular effort specifically requires the breakdown of ATP molecules, which is known as catabolism. Therefore, B is the correct answer.