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1. describle the functional organization of skeletalmuscle(muscle fibers, motor units, volume conductor, motornerves).

2. why does surface EMG look noisy?

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Jamar Ferry
Jamar FerryLv2
29 Sep 2019
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Related questions

1) Muscle tone is the result of:

a) asynchronous firing of motorunits

b) incomplete tetanus.

c) multiple muscle twitches.
d) multiple motor unit summation.

2) Under normal circumstances, at the level of single skeletalmuscle fibers, there are:

a) all-or-nonr responeses

b) graded contractions, depending onstimulus input

c) rapid spasmodic contractions, resulting in themain contraction

3) The muscles of the eye need to make precise small motormovements. Therefore, you would find large motor units in the eye,while you would find small motor units in postural muscle such asthe thigh.

a) True

b) False

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

2. Write a paragraph of 3-5 sentences describing 1) whether the statement is correct or incorrect and 2) the reasoning for your answer. Your answer should demonstrate your understanding of the physiological concepts underlying the statement and be written professionally

In a given muscle, the motor units containing slow-twitch oxidative muscle fibers are recruited first because they contain the most motor neurons.

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