Bio 150 Ch11old

  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.
  2. Which muscle cells have the greatest ability to regenerate?



    A) smooth
  3. Most skeletal muscles contain ________.



    B) a mixture of fiber types
  4. Fatigued muscle cells that recover rapidly are the products of ________.



    B) intense exercise of short duration
  5. The strongest muscle contractions are normally achieved by ________.



    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?



    D) motor units with larger, less excitable neurons
  7. Which of the following is not a usual result of resistance exercise?



    D) increase in the number of muscle cells
  8. Excitation-contraction coupling requires which of the following substances?



    B) Ca2+ and ATP
  9. Which of the following is a factor that affects the velocity and duration of muscle contraction?



    C) load on the fiber
  10. Myoglobin ________.



    C) stores oxygen in muscle cells
  11. What structure in skeletal muscle cells functions in calcium storage?



    C) sarcoplasmic reticulum
  12. What does oxygen deficit represent?



    D) the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used
  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.



    D) latent
  14. Creatine phosphate functions in the muscle cell by ________.



    C) storing energy that will be transferred to ADP to resynthesize ATP
  15. What controls the force of muscle contraction?



    D) multimotor unit summation
  16. The major function of the sarcoplasmic reticulum in muscle contraction is to ________.



    B) regulate intracellular calcium concentration
  17. What produces the striations of a skeletal muscle cell?



    C) the arrangement of myofilaments
  18. Which of the following are composed of myosin?



    C) thick filaments
  19. During muscle contraction, myosin cross bridges attach to which active sites?



    C) actin filaments
  20. Which of the following surrounds the individual muscle cell?



    C) endomysium
Author
eddardofwinter
ID
268090
Card Set
Bio 150 Ch11old
Description
old bank
Updated