What molecule most directly provides the energy needed for muscle contraction?

• A. ATP (Adenosine Triphosphate)
• B. NADH
• C. Glucose
• D. Lactic Acid

Answer: (A)

Verified step by step guidance

1. Understand that muscle contraction requires energy, which is provided by a specific molecule.
2. Identify the role of ATP (Adenosine Triphosphate) in cellular processes. ATP is known as the energy currency of the cell.
3. Recognize that ATP provides energy by releasing a phosphate group, converting into ADP (Adenosine Diphosphate) and releasing energy in the process.
4. Compare ATP with other molecules listed: NADH, Glucose, and Lactic Acid. Note that while these molecules are involved in energy metabolism, they do not directly provide energy for muscle contraction.
5. Conclude that ATP is the molecule that most directly provides the energy needed for muscle contraction, as it is immediately available to power the contraction process.