Normal heartbeat. Tachycardia is caused by something that disrupts the normal electrical impulses that control the rate of your heart's pumping action. Many things can cause or contribute to problems with the heart's electrical system.These factors include: 1  Damage to heart tissues from heart disease.2  Abnormal electrical pathways in the heart present at birth (congenital).n atrial flutter, the heart's atria beat very fast but at a regular rate. Atrial flutter is caused by irregular circuitry within the atria. The fast rate results in weak contractions of the atria. The rapid signals entering the AV node cause a rapid and sometimes irregular ventricular rate.
Definition: A diploid cell is a cell that contains two sets of chromosomes. One set of chromosomes is donated from each parent. Examples: The diploid number of a cell is the number of chromosomes in the cell. This number is commonly abbreviated as 2n, where n stands for the number of chromosomes.
Diploid human cells have 2 sets of 23 chromosomes for a total of 46 chromosomes: Autosomal chromosomes: 22 sets of 2. Sex chromosomes: 1 set of 2. Haploid Cell Reproduction. Haploid cells are produced by the process of meiosis. In meiosis, a diploid cell divides twice to produce four haploid daughter cells. Prior to the start of the meiotic cell cycle, the cell replicates it DNA and increases its mass and organelle numbers in a stage known as interphase.