a single motoneuron and all of the muscle fibers it innervates is called a…
What is a single motoneuron and all of the muscle fibers it innervates called?
Answer:
A single motoneuron and all of the muscle fibers it innervates is called a motor unit.
Understanding Motor Units:
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Motoneuron: This is a type of nerve cell that transmits signals from the spinal cord to a muscle, causing it to contract.
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Muscle Fibers: These are the cells that make up muscles and contract when they receive signals from motoneurons.
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Motor Unit Composition: Each motor unit consists of one motoneuron and all the muscle fibers it controls. The size of a motor unit varies depending on the muscle’s function—smaller units for fine, precise movements, and larger units for powerful, gross movements.
Function of Motor Units:
Motor units play a crucial role in muscle contraction. When a motoneuron is activated, it sends an electrical signal that causes all its innervated muscle fibers to contract simultaneously.
Summary: A motor unit includes a motoneuron and the muscle fibers it controls. This structure is essential for muscle movement and coordination, allowing for precise control and force exertion.
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