Muscle that is trained for endurance would have all of the following adaptations except:
A)an increased number of mitochondria.
B)an increased ability to store oxygen inside of muscle cells.
C)better vascularization, with more capillaries in the muscle.
D)an increased number of myofibrils in muscle fibers.

Question

Quizplus · Accepted Answer

Endurance training usually does not increase the number of myofibrils in muscle fibers. Myofibrils are responsible for muscle contraction, and their number is dependent on genetic factors and muscle fiber type, which do not change significantly with training. Endurance training does, however, increase the number of mitochondria, improve oxygen storage, and enhance vascularization, making more capillaries available to deliver oxygen and nutrients to the muscles.

Muscle That Is Trained for Endurance Would Have All of the Following