Final answer:
Physiological contraction causes synchronous muscle fiber recruitment by alternating the activation of motor units.
Step-by-step explanation:
When a maximal number of motor units in a muscle are recruited simultaneously, it causes synchronous recruitment of the muscle fibers.
This type of contraction is known as physiological contraction.
Physiological contraction allows for longer muscle contractions by alternating the activation of motor units, preventing complete muscle fatigue.
This recruitment mechanism is used by the nervous system to efficiently utilize skeletal muscles and generate maximum force of contraction.