Understanding Motor Units in Skeletal Muscles

What is a motor unit in the context of skeletal muscles?

• A single muscle fiber innervated by a single motor neuron

• A group of muscle fibers innervated by a single motor neuron

• A single muscle fiber innervated by multiple motor neurons

• A group of muscle fibers innervated by multiple motor neurons

How do small motor units contribute to muscle control?

• They increase muscle endurance

• They allow for powerful movements

• They reduce muscle fatigue

• They enable fine motor control

What is the process called when more motor units are activated to increase muscle tension?

• Relaxation

• Synchronization

• Recruitment

• Fatigue

Why are larger motor units activated after smaller ones?

• To prevent muscle damage

• To decrease muscle tension

• To increase muscle tension

• To conserve energy

How does the nervous system prevent complete muscle fatigue during prolonged contractions?

• By activating all motor units simultaneously

• By alternating active and resting motor units

• By reducing the number of active motor units

• By increasing the energy supply to muscles