Grade 12th passBotany

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

ankit singh

5 Years agoGrade 12th pass

5 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'.