Quiz on Muscles and Neuromuscular

What is a motor neuron?

• A nerve that stimulates involuntary muscles

• A nerve that stimulates skeletal muscles

• A nerve that communicates between muscles

• A nerve responsible for sensory information

What is a motor unit?

• A muscle and all its nerve fibers

• A motor neuron and all the muscle fibers it stimulates

• A group of muscles controlled by a single axon

• A collection of axon terminals in the neuromuscular junction

What is the neuromuscular junction?

• The connection between the brain and muscles

• The link between a motor neuron's axon terminal and a muscle fiber

• The synaptic cleft where two neurons meet

• The muscle’s storage site for calcium ions

What is the name of the gap between the axon terminal and the muscle fiber at the neuromuscular junction?

• Synaptic cleft

• Sarcolemma

• Axon terminal

• Receptor site

Which neurotransmitter is responsible for stimulating muscle contraction?

• Dopamine

• Serotonin

• Acetylcholine

• Glutamate

What triggers the sliding of actin filaments over myosin filaments during muscle contraction?

• The influx of sodium ions

• The release of calcium ions

• The action of acetylcholine

• The depolarization of the synaptic cleft

Which proteins are responsible for muscle contraction?

• Myosin and actin

• Actin and acetylcholine

• Myosin and calcium

• Sarcolemma and acetylcholine

What provides energy for creating the action potential in muscle fibers?

• Calcium ions

• Glucose stored as glycogen

• Acetylcholine

• Potassium ion

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What determines the size of a motor unit in a muscle?

• The number of axons connected to the muscle fiber

• The size and function of the muscle

• The amount of glycogen stored in the muscle

• The availability of calcium ions during contraction

What is the main advantage of parallel fiber architecture in muscles?

• Generates more force

• Allows attachment to multiple tendons

• Enables large ranges of motion and muscle shortening

• Packs more fibers into the muscle