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Define a "motor unit" and descibe the different "innervation tomuscle fibers" required for "fine control" and "heavy load" muscleuse. Please answer all parts.

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Nestor Rutherford
Nestor RutherfordLv2
28 Sep 2019
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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

If you accidentally grab a very hot frying pan with your right hand, _______ will _______ action potential frequency.
α motor neurons innervating the left elbow extensors; decrease
afferent neurons from the Golgi tendon organ in the right elbow extensors; increase
α motor neurons innervating the right elbow flexors; increase

afferent neurons from the intrafusal fibers of the right elbow flexors; increase
A 52-year-old woman has difficulty initiating voluntary movements. She can clearly state what she intends to do, describe exactly how she would do it, and picture herself doing it easily. When she is able to begin the motion, she can complete it smoothly and accurately, but she has difficulty beginning the motion. If the difficulty arises from a defect in one particular area of the nervous system, which area is most likely to be involved?
Spinal motor neurons
Spinocerebellum
Basal ganglia
Association cortex
Invertebrates have often been used in motor control studies because
motor control pathways in invertebrates are all reflex pathways and therefore are simpler than pathways in vertebrates.
often only a few neurons are involved in a particular step in an invertebrate motor control pathway.
individual neurons are simpler in invertebrates than in vertebrates, and therefore motor control pathways are also simpler.
invertebrates have many more motor neurons in a single pathway compared to vertebrates.

Please explain why!!

The primary motor cortex is not connected to the spinal cord, but instead information is passed through many different areas in the brain. Discuss how commands are generated in cortex, including different areas involved, and how they are eventually relayed to the spinal cord to control the somatic system. To answer the question select a specified outcome behavior like riding a bike or driving a car and use that to discuss the generation of required activity and the pathway, including possible feedback signals to generate a more precise motor command

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