Vertebrate striated muscle contraction is controlled (regulated) by the action of the proteins troponin and tropomyosin on the actin filaments. Nervous stimulation causes a depolarisation of the muscle membrane (sarcolemma) which triggers the release of calcium ions from the sarcoplasmic reticulum.
n. 1  Abnormally fast or deep respiration, which results in the loss of carbon dioxide from the blood, thereby causing a fall in blood pressure, tingling of the extremities, and sometimes fainting.
Tachypnea is the term that your doctor uses to describe your breathing if it is too fast, especially if you have fast, shallow breathing from a lung disease or other medical cause. The term hyperventilation is usually used if you are taking rapid, deep breaths.