LooseLeaf for Human Anatomy
5th Edition
ISBN: 9781259285271
Author: Michael McKinley Dr., Valerie O'Loughlin, Elizabeth Pennefather-O'Brien
Publisher: McGraw-Hill Education
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Question
Chapter 10, Problem 6CR
Summary Introduction
To determine:
The reason for the greater ratio of motor neurons in the muscle fiber that controls eye movement than in the postural muscles of the leg.
Introduction:
Muscle contraction requires an electrical stimulation from the central nervous system. A motor neuron sends signals to contract at a particular synapse between a neuron and a muscle cell. A motor unit is composed of a motor neuron and its muscle cells.
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Explain why the ratio of motor neurons to skeletal muscle fibers is greater in muscles that control eye movement than in postural muscles of the leg.
Define a motor unit. Of what physiological advantage is a small motor unit arrangement in skeletal muscle?
Explain why a latent period is observed between the application of a stimulus and contraction of the stimulated muscle.
Explain how a slight (but smooth) contraction differs from a vigorous contraction of the same muscle. Use the concepts of multiple motor unit summation.
Chapter 10 Solutions
LooseLeaf for Human Anatomy
Ch. 10 - What are the properties of muscle tissue?Ch. 10 - List and describe the connective tissue components...Ch. 10 - Describe how muscle attachments are organized to...Ch. 10 - Compare and contrast myofibrils and myofilaments.Ch. 10 - Prob. 5WYLCh. 10 - Describe the structural relationship between a...Ch. 10 - Prob. 7WYLCh. 10 - Prob. 8WYLCh. 10 - Prob. 9WYLCh. 10 - List the three types of skeletal muscle fibers,...
Ch. 10 - Prob. 11WYLCh. 10 - Prob. 12WYLCh. 10 - Prob. 13WYLCh. 10 - Prob. 14WYLCh. 10 - Prob. 15WYLCh. 10 - Describe smooth muscle cell structure. What are...Ch. 10 - Prob. 1MCh. 10 - Prob. 1MCCh. 10 - Prob. 2MCCh. 10 - Prob. 3MCCh. 10 - The plasma membrane of a skeletal muscle fiber is...Ch. 10 - In a skeletal muscle fiber, a triad is composed of...Ch. 10 - Prob. 6MCCh. 10 - Prob. 7MCCh. 10 - Prob. 8MCCh. 10 - Prob. 9MCCh. 10 - Which of the following changes in skeletal muscles...Ch. 10 - Compare the roles of the three concentric layers...Ch. 10 - Prob. 2CRCh. 10 - Prob. 3CRCh. 10 - Prob. 4CRCh. 10 - Describe in your own words the events that occur...Ch. 10 - Prob. 6CRCh. 10 - Briefly describe the differences between muscle...Ch. 10 - Explain why athletes who excel at short sprints...Ch. 10 - Prob. 9CRCh. 10 - Describe the structure of intercalated discs in...Ch. 10 - Prob. 1DCRCh. 10 - Prob. 2DCRCh. 10 - Prob. 3DCR
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- In a general sense, how do skeletal muscles produce movement?arrow_forwardIn the diagram below, label the fine structure of a muscle, down to one of its myofibrils. Identify the basic unit of contraction in a myofibril.arrow_forwardBoth the withdrawal reflex and the Golgi tendon reflex involve sensory signals that ultimately control the same type ofmotor neurons and both are protective. Explain how one reflex can cause muscle contraction while the other causes musclerelaxation.arrow_forward
- Name three differences between slow-twitch and fast-twitch muscle fibers.arrow_forwardEvery 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?arrow_forwardDescribe a muscle spindle and its function considering the following items. Use all terms in paragraph form to describe: - Extrafusal fibers - Intrafusal fibers - Alpha motor neurons - Gamma motor neurons - Capsule - Contraction - Afferent nerve fiber - Somatic reflex (as in the patellar reflex)arrow_forward
- Identify the steps that show how an action potentialproduced in the motor end-plate of the neuromuscularjunction eventually results in contraction of the muscle fiber.arrow_forwardAnatomy and physiology explain muscle contraction in several distinct steps starting the release of acetylcholine junction.arrow_forwardMuscle spindle structures consist of: Extrafusal muscle fibers and gamma motor neurons Extrafusal muscle fibers and alpha motor neurons Golgi tendon organs and gamma motor neurons Intrafusal muscle fibers and gamma motor neuronsarrow_forward
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