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Immediate source of energy for muscle contraction is A Glucose B GTP C Creatine phosphate D ATP

Immediate source of energy for muscle contraction is

A

Glucose

B

GTP

C

Creatine phosphate

D

ATP

 
 
 

Grade:12th pass

1 Answers

Adarsh Pal
askIITians Faculty 159 Points
3 years ago
  •  Active sites for myosin are present on actin which are masked by troponin in resting state. When Ca++ level increases it leads to the binding of calcium with a subunit of troponin on actin(thin) filaments and thereby remove the masking of active sites for myosin.
  • Utilizing the energy from ATP hydrolysis, the myosin head now binds to the exposed active sites on actin to form a cross bridge. 
  • This pulls the attached actin filaments towards the centre of ‘A’ band.
  •  The ‘Z’ line attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere, i.e., contraction. The myosin, releasing the ADP and P1 goes back to its relaxed state. Hence immediate source of energy for muscle contraction is ATP.
  • So, the correct answer is 'ATP'.

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