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.
FAST (stroke) FAST is an acronym used as a mnemonic to help detect and enhance responsiveness to stroke victim needs. The acronym stands for Facial drooping, Arm weakness, Speech difficulties and Time. Facial drooping: A section of the face, usually only on one side, that is drooping and hard to move.This can be recognized by a crooked smile.