Skeletal & cardiac muscle


Which of the following is common to both skeletal & cardiac muscle

a) Value of the resting membrane potential
b) Property of inherent rhythmicity
c) Type of contractile protein
d) Length of refractory period
e) Length of muscle fiber 


Answer 
a.T
b.F
c.T
d.F
e. F

Discussion 
a. 
b.
  • Inherent rhythmicity is a property of the tissue where tissue can repetitively contract and relax without any external stimuli 
  • following tissue has inheritant rhythmicity
  • Cardiac muscle
  • Smooth muscle
  • Neurons in central nervous system
c.
  • Both cardiac and skeletal muscle made up of similar contratlie protine 
  • Actin 
  • Myocine 
  • Tropomyosin 
  • Troponin 
  • Toponin I
  • Troponin C
  • Troponin T
d.

  • Click here  to see difference of absolute refractory between cardiac and skeletal muscle


e.
  • Cardiac muscle fiber length is about 50┬Ám
  • Skeletal muscle fiber length is about 200mm



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