Neuromuscular Control of Mvt - Marciniak

What is a muscle twitch?

• A prolonged muscle contraction caused by multiple stimuli

• A single, brief muscle contraction caused by a single stimulus

• A constant muscle contraction due to high-frequency stimulation

• A muscle contraction that occurs without any stimulus

What happens during tetanus in muscle contraction?

• The muscle relaxes completely between stimuli

• The muscle is unable to relax due to high-frequency stimulation

• The muscle contracts and relaxes in a rhythmic pattern

• The muscle contraction is weak and intermittent

Which of the following best describes force summation?

• A single stimulus causing a weak contraction

• Successive stimuli resulting in progressively stronger contractions

• A muscle contraction that occurs without any stimuli

• A constant contraction due to a single stimulus

What is a motor unit?

• A single muscle fiber

• A neuron and all the muscle fibers it innervates

• A group of neurons controlling a single muscle fiber

• A single neuron controlling multiple muscles

Which type of motor units are recruited first during muscle contraction?

• Fast Twitch Type IIx

• Fast Twitch Type IIa

• Slow Twitch Motor Units

• All motor units are recruited simultaneously

What is the relationship between muscle length and force generation?

• A very long muscle generates the most force

• A very short muscle generates the most force

• A muscle at medium length generates the most force

• Muscle length does not affect force generation

Which type of muscle contraction is characterized by muscle shortening?

• Isometric contraction

• Eccentric contraction

• Concentric contraction

• Reflexive contraction

What is the primary function of the Golgi Tendon Organ (GTO)?

• To initiate muscle contraction

• To sense changes in muscle length

• To inhibit contracting muscles and prevent injury

• To increase the speed of muscle contraction

Which of the following is true about Fast Twitch Type IIx muscle fibers?

• They have high aerobic capacity and fatigue resistance

• They have low anaerobic capacity and motor strength

• They have low aerobic capacity and high motor strength

• They are recruited first during low-intensity activities

What is the role of muscle spindles during muscle contraction?

• To inhibit muscle contraction

• To sense lengthening of the muscle and prevent damage to the muscle by contracting

• To initiate voluntary muscle contraction

• To increase the speed of muscle contraction