A single motor neuron and the muscle fibers it innervates are collectively called a:
Correct answer: B. Motor unit
- A. Sensory unit
- B. Motor unit
- C. Both A and B
- D. Cranial unit
Explanation
A sensory unit refers to the basic functional unit of the sensory system that is responsible for detecting and transmitting sensory information to the brain. It consists of a sensory receptor and the nerve fibers that connect it to the central nervous system. A motor unit refers to the basic functional unit of the motor system that controls muscle contraction. It consists of a motor neuron and the muscle fibres it innervates. There is no commonly recognized term called "cranial unit". However, there are cranial nerves, which are nerves that emerge directly from the brain and exit the skull through small openings.
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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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