state gov BSSC Laboratory Assistant Mock Test Series 2025 Biology Human Physiology Muscle and Skeletal System
Which part of the muscle contraction process is responsible for the shortening of the sarcomere?
1
The binding of acetylcholine at the neuromuscular junction.
2
The myosin head binding to actin and pulling it towards the center of the A-band.
3
The release of calcium ions from the sarcoplasmic reticulum.
4
The breakdown of ATP by the sarcoplasmic reticulum.