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What happens when these muscles contract?
When muscles contract, the brain sends signals through the nervous system to the motor neuron that supplies several muscle fibers. There are different versions of contraction, which includes voluntary and involuntary.
What motor unit has the fewest muscle fibers?
One that isn't needed for precise movement. Muscles that need precise control have motor units with more muscle fibers.
Would the ratio of motor neurons to muscle fibers be the greatest at the muscle that control the eye?
Yes, th ration of motor neurons to muscle fibers are greatest for the muscles that control eye.
Which fibers carry action potential to cause skeletal muscles to contract?
Alpha motor neurons
Why is there less precise control over leg muscles over eye muscles?
many muscle fibers are controlled by a single motor neuron
What is a motor unit is made up of?
Motor neurons and the muscle fibers they transmit signals toA motor unit is a collection of muscle fibers that contract as a single functional unit when stimulated by an impulse from a motor neuron. The actual size can vary greatly, from many large muscle fibers in the quadriceps muscle group per motor unit to just a few muscle fibers in the muscles of the fingers per motor unit.
What is the function of the glossopharyngeal?
It contains both sensory and motor fibers, and supplys the tongue soft palate, pharynx, and parotid gland.
How are motor units recruited?
Motor units can be recruited when the activation of the motor neuron activates all muscles fibers in the motor unit. The increase in tension occurs in steps proportional to the size of the motor unit.
DoesAfferent fibers carry messages to the muscles true or false?
False. Afferent fibers carry the messages to the brain while Efferent fibers carry them to the CNS which then goes directly to the motor unit for a reaction to the stimulus.
What is the function of the glossopharyngeal nerve?
It contains both sensory and motor fibers, and supplys the tongue soft palate, pharynx, and parotid gland.
Sensory information concerning position and balance motor neurons that control skeletal muscles travel over what type of fibers?
Type A
What part of nervous system controls voluntary movements thoughts and registration of incoming information?
The muscle fibers are functionally organized as motor units. A motor unit consists of a single motor neuron and all of the muscle fibers it innervates.Whole muscles exhibit characteristics that are more complex than those of individual muscle fibers or motor units. Instead of responding in an all-or-none fashion, whole muscles respond to stimuli in a graded fashion, which means that the strength of the contractions can range from weak to strong.
