I’m struggling in my medical biology class with understanding how a muscle contracts. This is what my teacher told me, but I still don’t fully grasp it and understand the T-tubles, myosin etc.
muscle contraction:
1. nerve impulse reaches the end of the nerve cell
2. the impulse travels over the sarcolemma
3. impulse travels further via the T-tubules into the muscle cell
4. Calcium (Ca2+) is released out of the sarcoplasmic reticulum
5. Ca2+ attaches to troponin
6. Tropomyosin moves away from the binding site
7. Myosin heads attach to actin (cross-bridge)
8. Myosin head makes a power stroke/work stroke
9. Sarcomere is in contraction
In: Biology
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