1.) Each motor neuron innervates a finite number of muscle fibers. We have refer
ID: 49990 • Letter: 1
Question
1.) Each motor neuron innervates a finite number of muscle fibers. We have referred to this set of muscle fibers as a motor unit. Do motor units vary in size?
a.) no, they average about the same throughout the musculature
b.) yes, fine control depends upon a motor unit with only several muscle fibers
2.) The cerebellar input that defines the status of the head originates within the left and right
a.) motor cortex b.) vestibular apparatus
3.) How are the muscle fibers within a motor unit arranged spatially within a muscle fascicle?
a.) adjacent to one another
b.) scattered somewhat throughout the fascicle
4.) What is the resting membrane potential of a muscle fiber?
a.) -90 mV
b.) -60 mV
5.)
In view of the difference between the resting membrane potential of a motor neuron and a muscle fiber, which cell is more leaky to sodium ions?
a.)motor neuron
b.) muscle fiber
Explanation / Answer
1.)
b.) yes, fine control depends upon a motor unit with only several muscle fibers
The number of muscle fibers among every unit will vary among a specific muscle and even a lot of from muscle to muscle ; the muscles that act on the most important body plenty have motor units that contain a lot of muscle fibers.
2.)
a.) motor cortex
Motor cortex is that the region of the cerebralcortex concerned within the coming up with, control, and execution of voluntary movements. Classically the excitable area is a locality of the lobe situated within the dorsal central gyrus straight off anterior to the sulcus centralis.
3.)
a.) adjacent to one another
5.)
a.) motor neuron
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.