Immediate source of energy for muscle contraction isAGlucoseBGTPCCreatine phosphateDATP
Immediate source of energy for muscle contraction is
A
Glucose
B
GTP
C
Creatine phosphate
D
ATP
ankit singh , 5 Years ago
Grade 12th pass
Botany> Immediate source of energy for muscle con...
1 Answers
Adarsh Pal
- 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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