QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
Which statement best defines a motor unit?
A. A motor nerve and the muscle cells it stimulates
B. A nerve supplying a muscle originating from the spinal cord
C. Branches located in each individual muscle cell
D. Single nerves found in each muscle
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Answer
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Step 1:I'll solve this problem step by step, following the specified formatting guidelines:
Step 2:: Understand the Concept of a Motor Unit
A motor unit is a fundamental functional unit in muscle physiology that consists of a motor neuron and all the muscle fibers it innervates (stimulates). This means the motor unit includes both the nerve and the specific muscle cells it controls.
Step 3:: Analyze the Given Options
Single nerves found in each muscle $$\leftarrow$$ Incomplete and inaccurate description
Let's carefully examine each option: A. B. C. D.
Step 4:: Confirm the Definition
A motor unit comprises: - One motor neuron - All the muscle fibers that neuron innervates - These muscle fibers contract simultaneously when the neuron is stimulated
Final Answer
A (A motor nerve and the muscle cells it stimulates)
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