NEETZoologyLocomotion and Movement
What initiates muscle contraction?
Options
- AIncrease in calcium ion level
- BFormation of cross-bridge between actin and myosin
- CA signal sent by CNS via a motor neuron
- DBreaking of ATP
Correct answer
C. A signal sent by CNS via a motor neuron
Step-by-step solution
The HMM component consists of the head and short arm of a meromyosin. The cross arm in the HMM component refers to the head and short arm projecting outwards at regular distance and angle from each other from the surface of a polymerised myosin filament.Myosin makes up the thick filament and is a polymerised protein. It is made up of meromyosin, a monomeric protein. Meromyosin has 2 parts: a globular head with short arm, called heavy meromyosin, and the tail, called light meromyosin. Muscle contraction is initiated