EBK BIOLOGY
4th Edition
ISBN: 8220102797376
Author: BROOKER
Publisher: YUZU
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Textbook Question
Chapter 44, Problem 7TY
Stimulation of a muscle fiber by a motor neuron occurs at
- a. the neuromuscular junction.
- b. the transverse tubules.
- c. the myofibril.
- d. the sarcoplasmic reticulum.
- e. none of the above.
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Stimulation of a muscle fiber by a motor neuron occurs ata. the neuromuscular junction.b. the transverse tubules.c. the myofibril.d. the sarcoplasmic reticulum.e. none of the above.
Which of the following statements are true of the neuromuscular junction? (Read carefully and select all the correct statements.)
A.
A synapse is the space between two muscle fibers.
B.
Acetylcholine is released from vesicles in the sarcolemma.
C.
The axon terminal is the end of a sensory neuron.
D.
Acetylcholine makes the sarcolemma more permeable to calcium ions.
E.
Cholinesterase is an enzyme that destroys acetylcholine so that the impulse will continue at the same strength.
F.
The receptors for acetylcholine are in the sarcolemma.
The part of the sarcolemma that invaginates into the interior of skeletal muscle fibers is thea. T tubule system. c. myofibrils. e. mitochondria.b. sarcoplasmic reticulum. d. terminal cisternae.
Chapter 44 Solutions
EBK BIOLOGY
Ch. 44.1 - Prob. 1CCCh. 44.2 - Prob. 1CCCh. 44.2 - Prob. 2CCCh. 44.2 - Prob. 1BCCh. 44.3 - Prob. 1CCCh. 44.3 - Prob. 1BCCh. 44.3 - What is the normal function of the PPAR- protein...Ch. 44.3 - CoreSKILL What was the hypothesis proposed by...Ch. 44.3 - CoreSKILL Assume that the mean weight of both...Ch. 44 - Prob. 1TY
Ch. 44 - Prob. 2TYCh. 44 - Prob. 3TYCh. 44 - Prob. 4TYCh. 44 - The function of ATP during muscle contraction is...Ch. 44 - Prob. 6TYCh. 44 - Stimulation of a muscle fiber by a motor neuron...Ch. 44 - Muscle fibers that have a large number of...Ch. 44 - Which of the following statements about movement...Ch. 44 - Prob. 10TYCh. 44 - Compare the structural and functional features of...Ch. 44 - List and briefly describe the steps in the...Ch. 44 - Prob. 3CQCh. 44 - Describe as many types of animal locomotion as you...Ch. 44 - Discuss the three types of muscle tissues found in...
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- Before a skeletal muscle fiber can contract,Ca2+ must bind toa. calsequestrin.b. calmodulin.c. the myosin head.d. troponin.e. actinarrow_forwardThe factor(s) that determine the duration of a twitch in various types of fibers is the speed of the a. movement of Na+ across their membranes only. b. removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP. c. removal of Ca2+ ions from the sarcoplasm only. d. removal of Ca2+ ions from the sarcoplasm and hydrolysis of ATP and movement of Na+ across their membranes. e. hydrolysis of ATP only.arrow_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
- 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_forwardTo make a muscle contract more strongly,the nervous system can activate more motorunits. This process is calleda. recruitment.b. summation.c. incomplete tetanus.d. twitch.e. concentric contractionarrow_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
- The functions of tropomyosin in skeletal muscle include A. releasing calcium ions after initiation of contraction. B. generating ATP which it passes to the contractile mechanism. C. binding to myosin during contraction. D. acting as a relaxing protein at rest by covering up the sites where myosin binds to actin. E. sliding on actin to produce shortening.arrow_forwardNervous stimulation of musclesa. occurs at a neuromuscular junction.b. results in an action potential that travels down the T system.c. causes calcium to be released from expanded regions of the sarcoplasmic reticulum.d. All of these are correctarrow_forwardTo stimulate muscle contraction, acetylcholine is released from the into the synaptic cleft. a. junctional folds O b. sarcolemma c. synaptic knob O d. terminal cisterna e. sarcoplasmic reticulumarrow_forward
- Which of the following is a microscopic feature of a skeletal muscle fiber? a. It contains multiple nuclei that are centrally located b. it contains myoglobin for oxygen storage c. it contains glycosomes for glycogen storage d. a and b e. b and carrow_forwardA decline in a skeletal muscle's ability to maintain a constant level of force or tension after prolonged repetitive stimulations is called A. complete tetanus B. recruitment C. fatique D. rigor mortisarrow_forwardThe series-elastic component of muscle contraction is responsible for a.increased muscle shortening to successive twitches. b.a time delay between contraction and shortening. c.the lengthening of muscle after contraction has ceased. d.all of these.arrow_forward
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