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
Some heart rhythm disorders can cause a fluttering in the chest, shortness of breath, chest pain or dizziness. Hyperthyroidism Hyperparathyroidism can cause fatigue and weakness, increased thirst, impaired thinking, and bone fractures. Atrial flutter. Atrial flutter is an abnormality of the heart's rhythm that causes rapid and sometimes irregular heartbeats. Aortic stenosis. Aortic stenosis is a condition of the heart causing shortness of breath, dizziness, or chest pain.