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Why does a motor unit of the eye have few musclefibers compared to a motor unit of the leg?

Human Biology (MindTap Course List)

11th Edition

ISBN:9781305112100

Author:Cecie Starr, Beverly McMillan

Publisher:Cecie Starr, Beverly McMillan

Chapter6: The Muscular System

Section: Chapter Questions

Problem 7RQ: What is a motor unit? Why does a rapid series of muscle twitches yield a stronger overall...

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A nerve fiber,together with all of the muscle fibers it innervates, is called amotor unit. A motor unit obeys the all-or-none law. Why?
Every skeletal muscle fiber is supplied by a motorneuron at the NMJ. Watch this video(http://openstaxcollege.org/l/skelmuscfiber) to learnmore about what happens at the neuromuscular junction. (a) What is the definition of a motor unit? (b) What is thestructural and functional difference between a large motorunit and a small motor unit? Can you give an exampleof each? (c) Why is the neurotransmitter acetylcholinedegraded after binding to its receptor?
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