BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
10th Edition
ISBN: 9781305967359
Author: STARR
Publisher: CENGAGE L
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Chapter 32, Problem 13SA
Cheetahs and human sprinters tend to have a high proportion of ________fibers in their leg muscles.
| a. white | b. fast red | c. slow red |
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In relaxed muscle, the myosin-binding site on actin is blocked by ________. a. titin b. troponin c. myoglobin d. tropomyosin
Smooth muscles differ from skeletal and cardiac muscles in that they ________. a. lack myofibrils b. are under voluntary control c. lack myosin d. lack actin
The power stroke of muscle contraction occurs as the myosin head pivots toward its tail and the thin filament slides along the length of the thick filament.
A. true
B. false
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- Motor units in a muscle contract _______________ and this helps _______________ fatigue. a. synchronously; prevent b. asynchronously; prevent c. synchronously; promote c. asynchronously; promote d. b and carrow_forwardThe muscles of a professional marathon runner are most likely to have ________.a. 80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibersb. 20 percent fast-twitch muscle fibers and 80 percent slow-twitch muscle fibersc. 50 percent fast-twitch muscle fibers and 50 percent slow-twitch muscle fibersd. 40 percent fast-twitch muscle fibers and 60 percent slow-twitch muscle fibersarrow_forwardThe muscles of a professional sprinter are most likely to have ________.a. 80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibersb. 20 percent fast-twitch muscle fibers and 80 percent slow-twitch muscle fibersc. 50 percent fast-twitch muscle fibers and 50 percent slow-twitch muscle fibersd. 40 percent fast-twitch muscle fibers and 60 percent slow-twitch muscle fibersarrow_forward
- Which 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_forwardOne of the primary reasons that one individual is faster in a 50-meter sprint than another is a. a greater number of muscle fibers of smaller diameter. b. more oxidative fibers in the lower limb muscles. c. an enhanced ability to deliver oxygen to the muscles. d. a greater percentage of fast-twitch fibers in the lower limb muscles.arrow_forwardIn sustained, moderate exercise, skeletal muscle is predominantly using ______________ as its energy source. a. amino acids b. glucagon c. fatty acids d. creatine phosphatearrow_forward
- Contraction of muscles requires binding of various components of muscle fiber. Which of the following rows correctly matches two components of muscle fibre that bind with each other? Row Component of muscle fibre Component of muscle fibre A. Ca2+ myosin B. troponin myosin C. troponin tropomyosin D. actin Ca2+arrow_forwardConsidering the Types of Skeletal Muscle Fibers, people that are naturally strong weight-Lifters are probably born with a higher percentage of Whereas a person that is naturally good at long-distance running, would probably be born with a higher percentage of, 31. olim A. Fast-twitch/white fibers : Slow-twitch/dark or red fibers B. Slow-twitch/dark or red fibers : Fast-twitch/white fibers C. Intermediate/green fibers : Tertiary Intermediate/purple fibers D. Tertiary Intermediate/purple fibers : Intermediate/green fibers 36 Seonbed is:arrow_forwardWhich 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_forward
- The 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_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_forwardMuscle contractions where the muscle shortens but tension remains constant are called A. isometric B. hypermetric C. hypotonic D. isotonic E. hypertonicarrow_forward
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