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
There are many causes of slow heartbeat, and they range from mild to serious. A slow heartbeat may be caused by cardiovascular disorders or diseases such as: Cardiac arrhythmias. Cardiomyopathy (weakened or abnormal heart muscle and function) Cardiovascular disease (due to atherosclerosis, hardening of the arteries, or other causes) Sinus node disease (abnormality of the heartâs internal pacemaker)