Types of contraction

Types of contraction

1. Muscular contraction

   • Muscular fiber contraction takes 2 ms
     • The latency period is the drawback of electric impulses

2. Muscular relaxation

   • In order to stop contractions, action potentials musn't be produced

3. ATP is needed both for muscular contraction and relaxation

   • Calcium is needed to contract the muscles
     • When contraction is no longer needed, calcium pumps return calcium to the sarcoplasm
   • 1 ATP= 8 muscular contractions
     • Phosphocreatine is used after ATP is consumed
       • Phosphocreatine is found mostly in meat
   • Carbohydrates are more efficient in ATP conversion
     • Krebs cycle= 30 ATP

4. Skeletic muscle contraction

   • Spasmodic contraction
     • Muscle is stimulated with an electric shock, contraction and relaxation occur rapidly
   • Graduated contraction
     • Stimulation of fibers
       • Strenght will vary depending on number of fibers that were stimulated