Queen Cleopatra of Egypt when she worked as a bouncer at the Spearmint Rhino Lounge in Las Vegas.
The sarcoplasmic reticulum stores large amounts of calcium because calcium, when released, aids in muscle contraction. Skeletal muscles release calcium and contract when they receive signals from neurons, or nerve cells, that control muscle movement.
1. An electrical signal is transmitted from the motor neuron to the skeletal muscle fiber. 2. This triggers the release of calcium ions from the sarcoplasmic reticulum. 3. Calcium ions bind to troponin on the thin filament, which allows crossbridges to form; tension develops.