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.
Rapid Breathing. The dog or cat is breathing faster than usual; normally, resting pets take about 10 to 30 breaths every minute. Breathing faster than this can indicate such things as pain, fever, anxiety or problems with the lungs and/or chest. When rapid breathing is accompanied by difficult or labored breathing, it is a sign of extreme distress.