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 cell nucleus is a double membraneâbound organelle that contains the genetic information of the cell packaged in the form of chromatin. The nucleus is a characteristic feature of most eukaryotic cells.
In eukaryotic cells, mitochondria and chloroplasts a â¦ lso contain DNA, which performs replication and transcription inside these organelles. In prokaryotic cells there is no nucleus. The DNA is in a region of the cytoplasm called the nucleoid, and that is where DNA replication and transcription occur in these cells.