EC Exam 3 Muscular System

Question 1

Contraction in Skeletal Muscle - Describe the steps (7)

Answer 1

1. Somatic motor neuron releases ACh at the neuromuscular junction.
2. A charge enters the transverse tubule
3. The charge passes through the transverse tubule (t-tubule) to the sarcoplasmic reticulum (S.R)
4. Ca2+ from the S.R. is released to into cytoplasm
5. Ca2+ binds with troponin, allowing actin filaments to bind with myosin filaments
6. Using ATP, myosin heads execute power stroke
7. Actin filament slides to center of sarcomere