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Multiple Choice
What is formed by a motor neuron and all the muscle cells it stimulates?
A
Motor unit
B
Sarcomere
C
Neuromuscular junction
D
Myofibril
Verified step by step guidance
1
Understand the components involved: A motor neuron is a nerve cell that transmits signals from the brain or spinal cord to a muscle, causing it to contract.
Identify the relationship: A motor neuron connects to multiple muscle fibers, and together they form a functional unit.
Define the term: The combination of a motor neuron and all the muscle fibers it innervates is known as a 'motor unit'.
Differentiate from other terms: A 'sarcomere' is the basic contractile unit of muscle fiber, a 'neuromuscular junction' is the synapse between a motor neuron and a muscle fiber, and a 'myofibril' is a component of muscle fibers composed of sarcomeres.
Conclude with the correct term: The correct answer to the problem is 'Motor unit', as it specifically describes the functional grouping of a motor neuron and the muscle fibers it controls.