Click and drag each description into the appropriate category to identify whether it is a factor that contributes to muscle fatigue, muscle endurance, or neither. 1. Muscular density of blood capillaries
2. Depletion of acetylcholine
3. Uncontrolled leakage of calcium from the SR
4. Depletion of ATP
5. A muscle's supply of glycogen
6. A muscle's supply of myoglobin
7. Accumulation of potassium in the extracellular fluid
8. The size of the motor unit a muscle belongs to
A. Fatigue
B. Endurance
C. Neither