Define a "motor unit" and descibe the different "innervation tomuscle fibers" required for "fine control" and "heavy load" muscleuse

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nlosch24Lv8

22 Mar 2023

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Related questions

1.) Each motor neuron innervates a finite number of musclefibers. We have referred to this set of muscle fibers as amotor unit. Do motor units vary insize?

a.) no, they average about the same throughout themusculature

b.) yes, fine control depends upon a motor unit with onlyseveral muscle fibers

2.) The cerebellar input that defines the status of the headoriginates within the left and right

a.) motor cortex b.)vestibular apparatus

3.) How are the muscle fibers within a motor unit arrangedspatially within a muscle fascicle?

a.) adjacent to one another

b.) scattered somewhat throughout the fascicle

4.) What is the resting membrane potential of a musclefiber?

a.) -90 mV

b.) -60 mV

5.)

In view of the difference between the resting membrane potentialof a motor neuron and a muscle fiber, which cell is more leaky tosodium ions?

a.)motor neuron

b.) muscle fiber

peachclam179

What is a motor unit? Briefly, explain how motor units functionin recruitment and in maintaining muscle tone. Describe thedifferent types of skeletal muscle fibers. Explain the type oftraining that could improve the performance of each type.