Motor Unit Quiz

What is the neuromuscular junction?

• Where the sensory nerve and muscle fiber meet

• Where the motor neurone and muscle fiber meet

• Where the motor neurone and sensory nerve meet

• Where the muscle spindle and sensory nerve meet

What is the function of motor neurones?

• To transmit sensory information to the brain

• To transmit the brain's instructions as electrical impulses to the muscles

• To transmit electrical impulses to the spinal cord

• To transmit sensory information to the muscles

What is the role of muscle spindles?

• To contract the muscle

• To sense the muscle stretching

• To transmit impulses to the brain

• To connect to the motor neurone

What happens when a motor neurone stimulates muscle fibers?

• Only some fibers contract

• All fibers contract partially

• Either all fibers contract or none contract

• The fibers do not contract

What is the primary function of muscle fibers in a motor unit?

• To transmit sensory information

• To contract in response to nerve impulses

• To stretch in response to sensory signals

• To connect to the spinal cord

How are muscle fibers grouped?

• Into sensory units

• Into motor units

• Into nerve bundles

• Into muscle spindles

What type of motor units are recruited for low intensity activities?

• Fast twitch motor units

• Slow twitch motor units

• Both fast and slow twitch motor units

• Neither fast nor slow twitch motor units

What is tetanic contraction?

• A single muscle twitch

• A sustained muscle contraction

• A relaxed muscle state

• A weak muscle contraction

What is spatial summation?

• Impulses received at the same time at different places

• Impulses received at different times at the same place

• Impulses that do not fire the neuron

• Impulses that decrease muscle strength

What is the role of calcium in muscle contraction?

• It inhibits muscle contraction

• It is not involved in muscle contraction

• It is released to allow muscle contraction

• It breaks down muscle fibers