Human Biology: Concepts and Current Issues (8th Edition)
8th Edition
ISBN: 9780134312729
Author: Johnson
Publisher: PEARSON
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Textbook Question
Chapter 6, Problem 13TY
Which of the following would have motor units with the smallest number of muscle cells?
a. thigh muscle
b. muscles in fingers
c. abdominal muscles
d. muscles of the back
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Which of the following would be recruited in a muscle stimulation when contractile strength increases?
A) Many small motor units with the ability to stimulate other motor units
B) Motor units with the longest muscle fibers
C) Motor units with larger, less excitable neurons
D) Large motor units with small, highly excitable endurance
Graph A in this diagram represents
A) summation and tetanus of a smooth muscle fibre.
C) a simple skeletal muscle twitch c) summation and tetanus of a skeletal muscle fibre.
D)simple smooth muscle twitch.
Following an injury to a nerve, the muscle it supplies with motor nerve fibers may become paralyzed. How would you explain to a patient the importance of moving the disabled muscles passively or contracting them using electrical stimulation?
Chapter 6 Solutions
Human Biology: Concepts and Current Issues (8th Edition)
Ch. 6 -
1. Do you think we should continue to try to...Ch. 6 - Prob. 2QCCh. 6 - Describe how muscle contraction can resist...Ch. 6 - Describe how a muscle's origin and insertion...Ch. 6 - Describe the roles of calcium in muscle...Ch. 6 -
4. Explain what causes rigor mortis.
Ch. 6 - Prob. 5CRCh. 6 - Prob. 6CRCh. 6 - Prob. 7CRCh. 6 -
8. Compare and contrast how a constant degree of...
Ch. 6 - Prob. 9CRCh. 6 - Prob. 10CRCh. 6 - Prob. 1TYCh. 6 -
2. Which of the following choices arranges the...Ch. 6 - All of the following are functions of the muscular...Ch. 6 -
4. Which of the following happens during muscle...Ch. 6 -
5. Botulism toxin inhibits the release of...Ch. 6 - The sliding filament mechanism describes the...Ch. 6 -
7. What is the first and most direct energy...Ch. 6 - As you clasp your hands in front of you and push...Ch. 6 -
9. All of the following may happen in response to...Ch. 6 - Which of the following is/are characteristic of...Ch. 6 - Which of the following is the site of calcium ion...Ch. 6 - What is the role of ATP in muscle function? a. ATP...Ch. 6 -
13. Which of the following would have motor units...Ch. 6 - Which type(s) of muscle cells can contract the...Ch. 6 - Prob. 15TYCh. 6 - Prob. 1AWKCh. 6 - Why do you think it is generally accepted medical...Ch. 6 - Prob. 3AWKCh. 6 - What would happen to a muscle if one of its...Ch. 6 - Prob. 5AWKCh. 6 - Prob. 6AWKCh. 6 - Prob. 7AWKCh. 6 - Prob. 8AWK
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- You are training athletes for the 100-meter dash. They need muscles specialized for speed and strength, not endurance. What muscle characteristics would your training regimen aim to develop? How would you alter it to train a long-distance swimmer?arrow_forwardWhat is a motor unit? Why does a rapid series of muscle twitches yield a stronger overall contraction than a single twitch?arrow_forwardIn a general sense, how do skeletal muscles produce movement?arrow_forward
- What is the function of the sarcoplasmic reticulum in muscle cell contraction?arrow_forwardWhich of the following does NOT have striated muscles? a. abdomen b. arm c. hamstring d. liverarrow_forwardIf a muscle cell had very short T-tubules, how much tension would the muscle fiber create, relative to a normal muscle fiber? Assume sarcoplasmic reticulum can still react to activity at the neuromuscular junction. a)Less tension would be created. b) No difference in tension creation. c) More tension would be created. d) No tension would be created.arrow_forward
- Regarding the muscles, why electric impulses are important in the contraction mechanisms? Explain.arrow_forwardA skeletal muscle motor unit A.Is the number of muscle cells innervated by one motor neuron. B.Is the number of motor neurons innervating one muscle cell. C.Size determines the ability to control a muscle D.Size determines how much a muscle contracts at any one time.arrow_forwardAll of the following characteristics apply to skeletal muscle except a. They are striated. b. They are multinucleated. c. They are voluntary. d. They contain intercalated discs. e. They are attached to the skeleton by means of tendons.arrow_forward
- What is the physiological mechanism that produces a quick and efficient skeletal muscle response to an external stimulus? A. voluntary motor commands from the brain B. temporal and spatial summation C. sensory nerve input to the brain D. spinal reflex arc E. endocrine secretory responsearrow_forwardWhy might stretching a cramping muscle INCREASE the cramping, as well as why would contracting the opposing muscle rapidly improve the situation?arrow_forwardWhy does a person with muscles that have a higher percentage of slow fibers have greater endurance than a person with muscles that have a lower percentage of slow fibers?arrow_forward
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