Mitochondria 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 mitochondria. Mitochondria are used to generate ATPs, efficiently, which is the energy currency of cells.
Learn More:
For more on cell adaptation check out;
https://brainly.com/question/11499324
https://brainly.com/question/8420657
#LearnWithBrainly