Medical Mcqs

Skeletal muscles_____________?
  • (A)  Contracts when calcium is taken up by sarcoplasmic reticulum
  • (B)  Contracts when actin and myosin filaments shorten
  • (C)  Contraction is initiated by calcium binding to troponin
  • (D)  Contraction is initiated by calcium binding to tropomyosin
In an isotonic contraction of the muscle________________?
  • (A)  The muscle moves a load through a distance
  • (B)  The muscle is not able to move the load
  • (C)  The latent period of contraction is shorter than isometric contraction
  • (D)  The length of muscle is increased
In myasthenia gravis_______________?
  • (A)  there is lack of acetyl choline
  • (B)  Lack of acetyl choline receptors
  • (C)  There is isometric contraction
  • (D)  Muscles are rigid and tough