Which of the following best describes the primary energy transformation that occurs when a person is running?

• A. Chemical energy is converted to kinetic energy.
• B. Thermal energy is converted to electrical energy.
• C. Kinetic energy is converted to potential energy.
• D. Light energy is converted to chemical energy.

Answer: (A)

Verified step by step guidance

1. Understand the concept of energy transformation: Energy transformation refers to the process of converting one form of energy into another. In biological systems, this often involves chemical energy stored in molecules being converted into other forms of energy to perform work.
2. Identify the source of energy in the human body: The primary source of energy for running comes from chemical energy stored in molecules like glucose and ATP (adenosine triphosphate). These molecules are broken down during cellular respiration to release energy.
3. Explain how chemical energy is used during running: When a person runs, the chemical energy stored in ATP is used by muscle cells to contract and produce movement. This process involves converting chemical energy into kinetic energy, which is the energy of motion.
4. Clarify why other options are incorrect: For example, thermal energy is not converted to electrical energy during running, and light energy is not involved in this process. Kinetic energy is not converted to potential energy in this context, as running primarily involves motion rather than storing energy in a higher position.
5. Conclude with the correct energy transformation: The primary energy transformation during running is the conversion of chemical energy (from ATP and glucose) into kinetic energy (motion of the body).