A motor neuron and all the muscle fibers it supplies is called:
Correct answer: A. Motor unit
- A. Motor unit
- B. Neuromuscular junction
- C. Neural unit
- D. Microtubules
Explanation
A motor neuron and all the muscle fibers it supplies are collectively referred to as a "motor unit". The size of a motor unit can vary depending on the muscle's function and the level of fine motor control required. For example, muscles involved in precise movements, such as those controlling the fingers or eyes, have smaller motor units with fewer muscle fibers per neuron. In contrast, larger muscles involved in gross movements, such as the muscles of the legs or back, have larger motor units with many muscle fibers per neuron.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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