Problem:

Question 1: Muscle fibers and the motor neurons that innervate them are organized into motor units. Which of the following is not a characteristic of motor units?

A. All motor neurons innervate the same number of muscle fibers.
B. All muscle fibers within a motor unit are of the same type.
C. The size of a motor unit is defined by its number of muscle fibers
D. Fatigue resistance depends on the motor unit type.

Question 2: Mitochondria are important for aerobic metabolism. There is a family of diseases that affect these organelles in different organs and tissues. What do you expect would be a consequence of mitochondrial dysfunction in skeletal muscle?

A. Muscles will become slower
B. Muscles will hypertrophy
C. Muscles will become faster.
D. Muscles will fatigue easier.

Please select correct answer and also provide explaination.