Shivering is considered sustained contractions and relaxation of skeletal muscle. Place the events for a single contraction of a skeletal muscle cell in the correct order from start to finish.
1) Calcium is actively pumped back into the sarcoplasmic reticulum reducing the amount of calcium in the sarcoplasm.
2) Cross bridges form.
3) Calcium binds troponin, triggering it to change shape and pivot.
4) Calcium is released from the terminal cisternae found in the sarcoplasmic reticulum into the sarcoplasm.
5) 5. Tropomyosin is pulled off the actin binding sites for myosin on the thin myofilament.
6) 6. Cross bridge detaches.
7) 7. Myosin heads are activated by hydrolysis of ATP and perform a power stroke.