Dr Gawad Physiology Course Online Exam - Excitable – Course Lecture 6

7 Questions | Total Attempts: 145

SettingsSettingsSettings
Physiology Quizzes & Trivia

7 MCQs (Only one correct answer)Each MCQ: 1 mark, Total mark: 7 (you will your result immediately by the web)Allowed time: 10 minGood Luckdr Mohammed Abel Gawad


Questions and Answers
  • 1. 
    During muscle contraction, all the following is true except:
    • A. 

      The binding sites at the actin filaments are activated by Ca.

    • B. 

      The sliding filament theory of contraction assumes that sliding of actin continues as long as Ca is attached to troponin C

    • C. 

      The detachment of myosin heads from actin needs binding of ATP.

    • D. 

      The transverse tubules (T.T.) contains Ca voltage gated channels

  • 2. 
    About the of skeletal muscles, all the following is true except:
    • A. 

      Hypertrophy develops as a result of forced repeated contractions.

    • B. 

      The function of the T system is the rapid transmission of the action potential from the cell -membrane to inside the muscle fibre

    • C. 

      After the spike potential, the muscle excitability is abolished

    • D. 

      Acetylcholine released at the M.E.P. is rapidly hydrolyzed by cholinesterase.

  • 3. 
    Among the steps of skeletal muscle relaxation:
    • A. 

      Inward spread of the depolarization wave along the transverse tubules.

    • B. 

      Pumping of Ca back into the sarcoplasmic reticulum.

    • C. 

      Release of Ca from the sarcoplasmic reticulum.

    • D. 

      Binding of Ca to troponin C.

  • 4. 
    Concerning isometric and isotonic muscle contractions:
    • A. 

      In isometric contraction, the elastic elements are not stretched.

    • B. 

      During isometric contraction a load is moved and work is done.

    • C. 

      During isotonic contraction most of the energy transformed into heat.

    • D. 

      During isotonic contraction the muscle length is not changed.

  • 5. 
    In skeletal muscles:
    • A. 

      The initiation of contraction occurs by binding of Ca to tropomyosin.

    • B. 

      The action potential follows the work done.

    • C. 

      The one way conduction at the M.E.P. is due to location of the chemical mediator (acetylcholine) in the nerve terminals.

    • D. 

      Fatigue sets in after fatigue occurs in the nerves.

  • 6. 
    A series of stimuli that cause summation of contractions leads to:
    • A. 

      Rigor.

    • B. 

      Contracture.

    • C. 

      Tonus.

    • D. 

      Tetanus

    • E. 

      Spasm.

  • 7. 
    Regarding reaction of degeneration, which of the following is true:
    • A. 

      There is increased muscle excitability

    • B. 

      Skeletal muscle responds to both faradic and galvanic current

    • C. 

      Skeletal muscle has longer chronaxie

    • D. 

      ACC is lower than CCC

Back to Top Back to top