NEETZoologyLocomotion and Movement
What is the mechanism of muscle contraction?
Options
- ASliding filament theory
- BContraction by release of neurotransmitter
- CBinding of calcium ions to troponin
- DShortening of the sarcomere
Correct answer
A. Sliding filament theory
Step-by-step solution
The mechanism of muscle contraction is best explained by the sliding filament theory, which states that contraction of a muscle fiber takes place by the sliding of the thin filaments over the thick filaments . Muscle fibers contain a red-colored oxygen-storing pigment called myoglobin. Myoglobin helps to store oxygen, which can then be utilized by the mitochondria in the muscles for ATP production.Muscle contraction is initiated by a signal sent by the central nervous system (CNS) via a motor neuron.The junction be