Question

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

Answer 1

Hint:- Muscle contraction is occurred when an action potential travels along the nerves to the muscles. This process begins when the nervous system generates a signal, this signal is only called action potential which travels along the motor neuron.

Complete answer:
Muscle contraction starts with a neural signal, an action potential arriving along a long neural fiber from a neuron in the spinal cord which is called as alpha motoneuron, to point out the muscle fiber.
The motion of muscle shortening occurs as myosin heads bind to actin and pull the actin inwards. This action requires energy which is provided by ATP. Myosin now binds to actin on the globular actin protein. It also has another binding site for ATP at which the enzymatic activity undergoes hydrolysis and converts ATP to ADP, which in result releases energy and some phosphate molecules. Muscle is a highly specialised tissue which is soft in nature and this produces tension which in the end results in production of force. Resting muscles store the energy in the form of ATP in the heads of myosin and then they wait for another contraction. There are many types of muscles present in our body, some of them are listed as follows: Skeletal muscles, cardiac muscles ( which are only found in the heart).

Hence the correct answer is option (C) ATP.

Note:- The muscular system is only responsible for functions such as maintenance of the posture, locomotion, and control movements of circulatory systems. Skeletal muscles are voluntary and striated whereas cardiac muscles are involuntary and striated.