What is stimulated to cause movement?

What is stimulated to cause movement?

• A. Motor units
• B. Nerve impulses
• C. Muscle fibers
• D. Brain signals

Answer: (A)

Movement is produced when motor units are stimulated. A motor unit is one motor neuron and all the muscle fibers it controls. When a nerve impulse reaches the motor neuron, it causes the muscle fibers in that unit to contract through a neuromuscular transmission process. This contraction generates the force that leads to movement. Brain signals initiate the command, but the actual contraction comes from activating the motor units via nerve impulses. Muscle fibers don’t contract on their own; they respond to the stimulation from the motor neuron, and the overall force increases as more motor units are recruited.

Movement is produced when motor units are stimulated. A motor unit is one motor neuron and all the muscle fibers it controls. When a nerve impulse reaches the motor neuron, it causes the muscle fibers in that unit to contract through a neuromuscular transmission process. This contraction generates the force that leads to movement. Brain signals initiate the command, but the actual contraction comes from activating the motor units via nerve impulses. Muscle fibers don’t contract on their own; they respond to the stimulation from the motor neuron, and the overall force increases as more motor units are recruited.