Final answer:
FG fibers primarily rely on anaerobic glycolysis for ATP production and are suited for rapid, powerful movements. They have large diameters, high glycogen content for glycolysis, but fatigue quickly. The correct completion of the statement about FG fibers is 'large glycogen reserves'.
Step-by-step explanation:
The student's question relates to the nervous innervation and characteristics of skeletal muscle fibers, specifically the fast, strong, glycolytic (FG) fibers. These fibers are classified as fast-twitch muscle fibers, predominantly involved in anaerobic activities such as sprinting or weightlifting. They utilize anaerobic glycolysis to produce adenosine triphosphate (ATP), the energy currency of cells, allowing them to generate power rapidly.
FG fibers have a large diameter, contain high levels of glycogen for quick ATP production through glycolysis, and therefore, have a high capacity for generating tension for rapid, powerful movements. However, due to their metabolic characteristics, they lack substantial quantities of mitochondria and myoglobin, leading to a white coloration and quicker fatigue when compared to oxidative fibers, which can sustain contractions for more extended periods due to their aerobic energy production capabilities.
Answering the student's statement, 'those that supply the fast, strong, glycolytic fibers have_______', we would fill in the blank with 'large glycogen reserves' to complete the statement accurately, as indicated by option 'c' in the provided multiple-choice question.