What causes sudden shivering?

Which type of muscle has very little mitochondria? What the name of a structure that releases enzymes for digestion? A psychologist who tries to help factory workers who have been diagnosed with sleep disorders is practicing? What is tertiary syphilis? What are large white blood cells with kidney bean shaped nuclei? What should the next steps in the investigation of the case called a headache or die for? What blood transfusion alternatives treatment for a ruptured spleen can a Jehovah's witness have? What is the site of FSH and LH stimulation after ovulation? How sitting up helps treat pulmonary edema? Why am i heavily spotting but not getting my period? What are red round solid slightly raised like blisters that itch on skin where clothing or shoes touch and not oozing or ringworm? Do having mild anterior osteophyte formation c4-5 and c5-6 is that osteoarthritis? Is asthma real? Is there such thing as carpal tunnel syndrome in your elbow? What is bladder cancer? Where do bacteriophages live? Which type of receptor is common in the heart? Why do you think some vaccination procedures require a booster injection? What is the difference between a bride and a bridesmaid? What happen if there is a hole between the right and left sides of the heart?