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 (or tachypnoea) (Greek : rapid breathing) is abnormally rapid breathing. In adult humans at rest, any rate between 12 and 20 breaths per minute is normal and tachypnea is indicated by a ventilatory rate greater than 20 breaths per minute.