Causes of Heart Palpitations. Many things can cause heart palpitations. In the vast majority of cases, the cause is either related to your heart or is unknown. Non-heart-related causes of palpitations include: 1  Strong emotions such as anxiety, fear, or stress; palpitations often occur during panic attacks.2  Vigorous physical activity.therosclerosis is the process of narrowing and hardening of the arteries due to plaque buildup in the inner lining of arteries. It's the key cause of heart attacks and strokes and the No. 1 killer in the U.S. When it comes to developing health risks from atherosclerosis, some people are at higher risk than others.
The nucleus is considered to be one of the most important structures of eukaryotic cells as it serves the function of information storage, retrieval and duplication of genetic information. It is a double membraneâbound organelle that harbours the genetic material in the form of chromatin.
What organelle contains the DNA of the cell? Most of the DNA in a cell is contained in the nucleus. However, DNA  can be found in mitochondria within animals, plants and fungi, and  in chloroplasts in plants as well.