Bio 150 Ch11old

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Author:
eddardofwinter
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268090
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Bio 150 Ch11old
Updated:
2014-03-26 17:20:04
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Bio
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  1. What is the role of tropomyosin in skeletal muscles?
    A) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
    B) Tropomyosin serves as a contraction inhibitor by blocking the actin binding sites on themyosin molecules.
    C) Tropomyosin is the receptor for the motor neuron neurotransmitter.
    D) Tropomyosin is the name of a contracting unit.
    A) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.
    (this multiple choice question has been scrambled)
  2. Which muscle cells have the greatest ability to regenerate?
    A) cardiac
    B) no muscle can regenerate
    C) skeletal
    D) smooth
    D) smooth
    (this multiple choice question has been scrambled)
  3. Most skeletal muscles contain ________.
    A) a mixture of fiber types
    B) a predominance of slow oxidative fibers
    C) muscle fibers of the same type
    D) a predominance of fast oxidative fibers
    A) a mixture of fiber types
    (this multiple choice question has been scrambled)
  4. Fatigued muscle cells that recover rapidly are the products of ________.
    A) slow exercise of long duration
    B) intense exercise of long duration
    C) intense exercise of short duration
    D) slow exercise of short duration
    C) intense exercise of short duration
    (this multiple choice question has been scrambled)
  5. The strongest muscle contractions are normally achieved by ________.
    A) increasing the stimulation up to the maximal stimulus
    B) recruiting small and medium muscle fibers
    C) increasing stimulus above the threshold
    D) increasing stimulus above the treppe stimulus
    A) increasing the stimulation up to the maximal stimulus
  6. Which of the following would be recruited later in muscle stimulation when contractile strength increases?
    A) motor units with the longest muscle fibers
    B) many small motor units with the ability to stimulate other motor units
    C) large motor units with small, highly excitable neurons
    D) motor units with larger, less excitable neurons
    D) motor units with larger, less excitable neurons
    (this multiple choice question has been scrambled)
  7. Which of the following is not a usual result of resistance exercise?
    A) increase in the number of muscle cells
    B) increase in the efficiency of the circulatory system
    C) increase in the number of myofibrils within the muscle cells
    D) increase in the efficiency of the respiratory system
    A) increase in the number of muscle cells
    (this multiple choice question has been scrambled)
  8. Excitation-contraction coupling requires which of the following substances?
    A) Ca2+ and ATP
    B) ATP and glucose
    C) ATP only
    D) Ca2+ only
    A) Ca2+ and ATP
    (this multiple choice question has been scrambled)
  9. Which of the following is a factor that affects the velocity and duration of muscle contraction?
    A) muscle length
    B) number of muscle fibers stimulated
    C) size of the muscle fibers stimulated
    D) load on the fiber
    D) load on the fiber
    (this multiple choice question has been scrambled)
  10. Myoglobin ________.
    A) breaks down glycogen
    B) stores oxygen in muscle cells
    C) is a protein involved in the direct phosphorylation of ADP
    D) produces the end plate potential
    B) stores oxygen in muscle cells
    (this multiple choice question has been scrambled)
  11. What structure in skeletal muscle cells functions in calcium storage?
    A) mitochondria
    B) sarcoplasmic reticulum
    C) intermediate filament network
    D) myofibrillar network
    B) sarcoplasmic reticulum
    (this multiple choice question has been scrambled)
  12. What does oxygen deficit represent?
    A) amount of energy needed for exertion
    B) the amount of oxygen taken into the body immediately after the exertion
    C) the amount of oxygen taken into the body prior to the exertion
    D) the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used
    D) the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used
    (this multiple choice question has been scrambled)
  13. Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the ________ period during which the events of excitation-contraction coupling occur.
    A) refractory
    B) latent
    C) contraction
    D) relaxation
    B) latent
    (this multiple choice question has been scrambled)
  14. Creatine phosphate functions in the muscle cell by ________.
    A) forming a chemical compound with actin
    B) storing energy that will be transferred to ADP to resynthesize ATP
    C) inducing a conformational change in the myofilaments
    D) forming a temporary chemical compound with myosin
    B) storing energy that will be transferred to ADP to resynthesize ATP
    (this multiple choice question has been scrambled)
  15. What controls the force of muscle contraction?
    A) multimotor unit summation
    B) treppe
    C) wave summation
    D) concentric contractions
    A) multimotor unit summation
    (this multiple choice question has been scrambled)
  16. The major function of the sarcoplasmic reticulum in muscle contraction is to ________.
    A) regulate intracellular calcium concentration
    B) provide a source of myosin for the contraction process
    C) make and store phosphocreatine
    D) synthesize actin and myosin myofilaments
    A) regulate intracellular calcium concentration
    (this multiple choice question has been scrambled)
  17. What produces the striations of a skeletal muscle cell?
    A) a difference in the thickness of the sarcolemma
    B) the T tubules
    C) the arrangement of myofilaments
    D) the sarcoplasmic reticulum
    C) the arrangement of myofilaments
    (this multiple choice question has been scrambled)
  18. Which of the following are composed of myosin?
    A) Z discs
    B) thick filaments
    C) thin filaments
    D) all myofilaments
    B) thick filaments
    (this multiple choice question has been scrambled)
  19. During muscle contraction, myosin cross bridges attach to which active sites?
    A) Z discs
    B) actin filaments
    C) thick filaments
    D) myosin filaments
    B) actin filaments
    (this multiple choice question has been scrambled)
  20. Which of the following surrounds the individual muscle cell?
    A) endomysium
    B) epimysium
    C) perimysium
    D) fascicle
    A) endomysium
    (this multiple choice question has been scrambled)

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