An organelle is a specialized cellular structure in eukaryotic cells analogous to an organ in the body.Organelles are discrete structures within the cell that perform a specialized function. Most are surrounded by internal membranes and can be seen in the light or the electron microscope.n organelle is a specialized cellular structure in eukaryotic cells analogous to an organ in the body.
irregular pulse or heart palpitations; chest pain; pale skin; sweating; What causes abnormal heart rhythms? A number of things may cause an abnormal heartbeat, including high blood pressure. Other common causes are: Coronary heart disease. This serious heart problem occurs when cholesterol and other deposits block the coronary arteries. Medications
While palpitations are usually harmless, they could be signs of a serious heart rhythm abnormality or heart disease until proven otherwise. A revved-up thyroid (hyperthyroidism) can increase the effects of adrenaline, a stress hormone in the body, which can cause a rapid heart rhythm or arrhythmia.