ETEXT CAMPBELL BIOLOGY IN FOCUS INSTANT
3rd Edition
ISBN: 9780135964422
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 39, Problem 5TYU
Curare, a substance that blocks the acetylcholine receptors on skeletal muscle, will cause
- A. rapid muscle twitches.
- B. sustained muscle contraction (tetanus).
- C. muscle relaxation.
- D. no effect in the absence of acetylcholinesterase.
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Students have asked these similar questions
The contractile response in skeletal muscle
A. produces more work when the muscle contracts isometrically than the muscle contracts isotonically.
B. does not last as long as the action potential.
C. produces more tension when the muscle contracts isometrically than when the muscle contracts isotonically.
D. starts after the action potential is over.
E. decreases in magnitude with repeated stimulation.
A 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.
Muscle tone is: a. the result of voluntary shortening of the muscle. b. the result of a small amount of involuntary activation of motor units by the nervous system. c. abnormal—a person’s muscles should be relaxed normally. d. present only where there is damage to the nervous system.
Chapter 39 Solutions
ETEXT CAMPBELL BIOLOGY IN FOCUS INSTANT
Ch. 39.1 - Contrast the role of Ca2+ in the contraction of a...Ch. 39.1 - WHAT IF? Why are the muscles of an animal that has...Ch. 39.1 - Prob. 3CCCh. 39.2 - Prob. 1CCCh. 39.2 - Prob. 2CCCh. 39.2 - Prob. 3CCCh. 39.3 - Prob. 1CCCh. 39.3 - MAKE CONNECTIONS How is the lunar-linked rhythm of...Ch. 39.4 - How might associative learning explain why...Ch. 39.4 - Prob. 2CC
Ch. 39.4 - MAKE CONNECTIONS How might a learned behavior...Ch. 39.5 - Prob. 1CCCh. 39.5 - MAKE CONNECTIONS Balancing selection can maintain...Ch. 39.6 - Prob. 1CCCh. 39.6 - Prob. 2CCCh. 39 - During the contraction of a vertebrate skeletal...Ch. 39 - Prob. 2TYUCh. 39 - According to Hamiltons rule, A. natural selection...Ch. 39 - The binding of calcium to the troponin complex A....Ch. 39 - Curare, a substance that blocks the acetylcholine...Ch. 39 - Prob. 6TYUCh. 39 - Prob. 7TYUCh. 39 - SCIENTIFIC INQUIRY Propose a hypothesis to explain...Ch. 39 - Prob. 9TYUCh. 39 - Prob. 10TYUCh. 39 - FOCUS ON INFORMATION Learning is defined as a...Ch. 39 - Prob. 12TYU
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- Which of the following effects result(s) from aging on the muscular system?a. Muscle mass declines.b. Slow-twitch fibers are affected most by aging.c. Fatigue occurs more quickly.d. Increased muscle tone limits stability.e. The gait lengthens and is slower.arrow_forwardThe muscle relaxes if no new nerve signal arrives. However the neurotransmitter from the previous stimulation is still present in the synapse. The activity of ________ helps to remove this neurotransmitter. a. myosin b. action potential c. tropomyosin d. acetylcholinesterasearrow_forwardThe action potential of skeletal muscle A. is not essential for contraction. B. is longer than the action potential of cardiac muscle. C. has a prolonged plateau phase. D. causes the immediate uptake of calcium ions into the lateral sacs of the sarcoplasmic reticulum. E. spreads inward to all parts of the muscle via the T tubules.arrow_forward
- The 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_forwardWhich of the following is true? A. Muscle fibers either will contract with all the force possible under existing conditions or will not contract at all. B. Skeletal muscles can contract with varying degrees of strength given different circumstances. C. Muscle length does not have an effect on contractile strength. D. Metabolic condition of the myocyte does not have an effect on contractile strength.arrow_forwardDuring low intensity, long-duration exercise (long-distance running, for example), fatigue is NOT believed to be caused by: 30. A. The declining levels of muscle glycogen and blood glucose levels. B. The loss of extracellular electrolytes through sweating. C. The partial fatigue of neurons within the Cerebrum. D. The decrease in interstitial temperature observed in active muscle fibers.arrow_forward
- Which of the following sentences is NOT correct? A. White fibers make up fast-twitch muscle B. Muscle spindle is a type of receptor that detects muscle length C. Exocrine gland secretes its product directly into the bloodstream D. When an action potential is generated within a motor neuron, every muscle cell of the motor unit is stimulated to contractarrow_forwardWhich statement(s) about human neuromuscular innervation is/are true? A. A single spinal motor neuron innervates multiple muscle fibers. B. The majority muscle fibers are innervated by two or more motor neurons. C. Polyneuronal innervation of adult muscles fibers is possible, but rather rare. D. Each spinal motor neuron innervates a single skeletal muscle fiber.arrow_forwardWhich of the following statements relating to the factors affecting the force of muscle contraction is false? a. skeletal muscles contract strongest when the muscle fibers are 80-120% their resting length b. low frequency of stimulation generates decreased force c. larger muscle fibers can generate more tension to generate stronger contractions d. more motor units recruited causes stronger contractions e. none of the abovearrow_forward
- The fast fatigable motor units are used predominantly for which of the following activities? a. The action potentials fired by alpha motor neurons become slower. b. Slow twitch muscle fibers show increased myosin ATPase. c. Fast fatigable motor units are recruited before slow twitch motor units. d. None of the answers. e.All of the answers.arrow_forwardWhich of the following describes a similarity between cardiac and smooth muscle cells?a. An action potential always precedes contraction.b. The majority of the Ca21 that activates contraction comes from theextracellular fluid.c. Action potentials are generated by slow waves.d. An extensive system of T-tubules is present.e. Ca21 release and contraction strengths are gradedarrow_forwardif, in a laboratory, a skeletal muscle cell receives a single stimulus to contract, it produces a single muscle twitch. If we quickly fire another stimulus for the muscle to contract, prior to the muscle fully relaxing, then we have a condition of: A. seizure B. none of the above C. complete tetanus D. temporal summation E. relaxation The _________________ phase of the Sliding Filament Model of Contraction occurs when myosin and actin separate from one another. A. cocking of the myosin head B. cross bridge detachment C. cross bridge formation D. action potential E. calcium release During contraction, the bulk of calcium comes from the?arrow_forward
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