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
What causes it? The most common causes of decreased heart rate are sinus bradycardia, heart failure, and high blood pressure. Other possible causes, such as heart block, are more rare. Within all the people who go to their doctor with decreased heart rate, 54% report having shortness of breath, 42% report having dizziness, and 34% report having fainting.