A 14-year-old swimmer notices that her muscles cramp after a long swim. Which process is responsible for the rapid accumulation of Na+ ions in her muscle cells?
Q1. A 14-year-old swimmer notices that her muscles cramp after a long swim. Which process is responsible for the rapid accumulation of Na+ ions in her muscle cells?
Answer: Passive transport
Explanation: Passive transport, specifically diffusion, allows for the rapid accumulation of Na+ ions in muscle cells due to the concentration gradient.