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 muscle cells, magnesium ions compete with calcium ions for binding sites on troponin molecules. If a person has too high a concentration of magnesium ions in the blood, magnesium ions can prevent calcium ions from binding troponin.
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
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- The function of Ca2+ in skeletal muscle contraction is toa. cause an allosteric change in myosin so it detaches from actin.b. provide the energy necessary for the movement of the cross-bridge.c. expose the myosin-binding sites on the thin filaments.d. bind to tropomyosin.e. do a and c only.arrow_forwardChickens are capable of only brief bursts of flight, and their flying muscles consist of fast glycolytic fibers. The breast muscles of ducks, by contrast, consist of slow and fast oxidative fibers. What can you deduce about the flying abilities of ducks?arrow_forwardWhich 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.arrow_forward
- The figure below shows the muscle tension (Y axis) following the application of stimuli to the muscle fiber. The pink arrows on the bottom symbolize stimuli to the muscle cell. The best explanation that the tension of the contraction in panel 4 is larger than other panels is because: A. More motor units are recruited B. More muscles are contracting C. The duration of the stimuli is longer D. The frequency of the stimuli is greaterarrow_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_forwardTo demonstrate muscle fatigue, a student held an 8 lb dumbbell in her hand and abducted her arm parallel to the floor. After 45 seconds, she has having difficulty holding that position so she rotated her hand 90 degrees. This allowed her to hold the dumbbell in position for an additional 20 seconds. Which of the following is the best explanation for this? A. Different motor units were contracting while others were relaxing. B. Muscles began to contract isotonically rather than isometrically. C. The load was reduced. D. The resistance to contraction was reduced. E. The change in position provided a greater range of motion at the shoulder.arrow_forward
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