Musculoskeletal Physiology
A 25-year-old sprinter presents with acute posterior thigh pain after feeling a "pop" during acceleration. Examination reveals tenderness and ecchymosis over the hamstring muscle belly. MRI shows a partial thickness tear of the biceps femoris. The sports medicine physician explains the injury in terms of muscle structure and function. Regarding skeletal muscle physiology:
Mark each as TRUE or FALSE
Skeletal muscle has a hierarchical structure: muscle → fascicles (surrounded by perimysium) → muscle...
Excitation-contraction coupling involves action potential propagation along the sarcolemma and T-tub...
The sarcomere is bounded by M-lines; the I-band contains myosin and shortens during contraction; cal...
Type I (slow-twitch, oxidative) fibers are fatigue-resistant with high mitochondrial content, suited...
Muscle injuries commonly occur at the myotendinous junction where stress concentration is highest; e...
Answer the questions to see explanations
Click T (True) or F (False) for each option