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
Disease â illness places pressure on the body, leading to an increased heart rate. Drugs â depending on the drug, it can speed up or slow down the heart rate. Body Temperature â cold will initially raise the pulse rate, before slowing dramatically. Fever (pyrexia) will cause an increase in pulse rate.