<u>Mitochondria</u>is the organelle(s) you would expect to be very abundant in the muscle cells from the thigh of a long distance runner.
Explanation:
The muscle cells of an athlete need to be adapted for high sports-related activity. These cells require more energy., compared to a non-athlete, so as to power the heightened levels of activity of the muscles. Therefore the muscles cells will have a significantly higher number of <u>mitochondria. Mitochondria </u>are used to generate ATPs, efficiently, which is the energy currency of cells.
