02-27-2007, 06:03 PM
A 23-year-old track runner comes to your office complaining of lower extremity pain. The pain is localized to the right lower hamstrings. The patient sensed the pain immediately after completing a 1-mile sprint. Which of the following statements is true regarding muscle fibers?
A Cardiac muscle does not have actin and myosin organized into sarcomers.
B Red muscle fibers have a large mass per motor unit.
C Skeletal cells have limited sarcoplasmic reticulum.
D Smooth muscles have high ATPase activity.
E White muscles have a high capacity for anaerobic glycolysis
A Cardiac muscle does not have actin and myosin organized into sarcomers.
B Red muscle fibers have a large mass per motor unit.
C Skeletal cells have limited sarcoplasmic reticulum.
D Smooth muscles have high ATPase activity.
E White muscles have a high capacity for anaerobic glycolysis