Essentials of Human Anatomy & Physiology & Modified Mastering A&P with Pearson eText w/ ValuePack Access Card
1st Edition
ISBN: 9780133902341
Author: Elaine N. Marieb
Publisher: PEARSON
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Chapter 6, Problem 5MC
Summary Introduction
Introduction:
The skeletal muscle cells require stimulation for the contraction of the muscles. A nerve cell is responsible for the stimulation of the muscle cells. The long threadlikeextension of the neuron is called the axon. This axon branches into the many axon terminals as they arrive at the skeletal muscle cells. These axon terminals form the junction with the sarcolemma of the muscle cells and are called neuromuscular junctions.
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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.
Which is a false statement about skeletal muscle structure?a. A myofibril is composed of multiple muscle fibers.b. Most skeletal muscles attach to bones by connective-tissue tendons.c. Each end of a thick filament is surrounded by six thin filaments.d. A cross-bridge is a portion of the myosin molecule.e. Thin filaments contain actin, tropomyosin, and troponin.
Chapter 6 Solutions
Essentials of Human Anatomy & Physiology & Modified Mastering A&P with Pearson eText w/ ValuePack Access Card
Ch. 6 - More than one choice may apply. Identify the...Ch. 6 - Prob. 2MCCh. 6 - More than one choice may apply. Which of the...Ch. 6 - Prob. 4MCCh. 6 - Prob. 5MCCh. 6 - 6. Which of the following muscles attach to the...Ch. 6 - Which of these thigh muscles causes movement at...Ch. 6 - 8. Which of the following insert on the...Ch. 6 - What is major function of muscle?Ch. 6 - Compare skeletal, smooth, and cardiac muscles in...
Ch. 6 - Prob. 11SAECh. 6 - Prob. 12SAECh. 6 - Prob. 13SAECh. 6 - Describe how a neurotransmitter is released into...Ch. 6 - Prob. 15SAECh. 6 - Prob. 16SAECh. 6 - Prob. 17SAECh. 6 - Prob. 18SAECh. 6 - Prob. 19SAECh. 6 - Prob. 20SAECh. 6 - If you were alternately contracting and relaxing...Ch. 6 - The sternocleidomastoid muscles help to flex the...Ch. 6 - Prob. 23SAECh. 6 - Name the prime mover of elbow flexion. Name its...Ch. 6 - Prob. 25SAECh. 6 - The hamstring and quadriceps muscle groups are...Ch. 6 - 27. What two-bellied muscle makes up the calf...Ch. 6 - 28. What happens to muscles when they are...Ch. 6 - Prob. 29SAECh. 6 - 30. Should a triathlete engage in aerobic or...Ch. 6 - Prob. 31CAQCh. 6 - Phil loved to play squash. During a particularly...Ch. 6 - While painting her house, Susan fell off the...Ch. 6 - Prob. 34CAQCh. 6 - 37. Chemical A binds and blocks acetylcholine...
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- In a skeletal muscle fiber, Ca2+ is released from a. ACh receptors. b. the motor end plate. c. the sarcoplasmic reticulum. d. the sarcolemma and T-tubules.arrow_forwardWhich of the following statements best describes the sliding filament mechanism of muscle contraction? a. Actin and myosin filaments do not shorten, but rather, slide past each other. b. Actin and myosin filaments shorten and slide past each other. c. As they slide past each other, actin filaments shorten, but myosin filaments do not shorten. d. As they slide past each other, myosin filaments shorten, but actin filaments do not shorten.arrow_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
- When a muscle fiber is stretched from 60% of its optimal length to Lo, what change or changes are happening on the cellular level (MULTIPLE SELECT)? A. Increased calcium release from the SR B. Increased firing of action potentials from the alpha motor neuron C. Increased rate of myosin ATPase activity D. Increased number of actin-myosin bridges E. Increased stretch on titin, producing more passive forcearrow_forwardUnlike skeletal muscle cells, cardiac muscle cells________."  A do not use the sliding filament mechanism of contraction  B are not striated  C do not rely on an influx of Ca+2 for contraction to occur  D do not require neural stimulation to contractarrow_forwardA bacterial toxin is known to block the release of ACh at the motor end plate of skeletal muscle. Consequently, a. the skeletal muscle contracts with increasing force. b. the skeletal muscle contracts with increasing frequency. c. the ability to stimulate the muscle is impaired. d. other neurotransmitters would stimulate the muscle.arrow_forward
- A 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_forwardIn an isometric contraction, the muscle develops tension but does not: a. Expend energy.b. Exhibit elasticity.c. Lengthen.d. Conduct electrical current.e. Widenarrow_forwardMuscle relaxation occurs when ________. a. calcium ions are actively transported out of the sarcoplasmic reticulum b. calcium ions diffuse out of the sarcoplasmic reticulum c. calcium ions are actively transported into the sarcoplasmic reticulum d. calcium ions diffuse into the sarcoplasmic reticulumarrow_forward
- The diagram below represents the terminal cisterna in a muscle. Name and briefly explain the function of the structures represented by A, B and C, in the regulation of calcium ions during muscle contractionarrow_forwardDuring a concentric contraction of a skeletal muscle fiber, myofibrils a. lengthen. b. remain the same length. c. increase in diameter. d. shorten.arrow_forward
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