Heart Essay: The Development Of The Human Heart

George Tanas
Mina Younan
15 March 2016
English II honors

The Development of the Human Heart

We all know many fascinating facts about the human heart, but we never stop to think how it develops and how it came to being. Many organs developed during your conception period. One of those organs that developed during this stage was the heart. It is really nothing more than a pump, composed of muscle which pumps blood throughout the body, beating approximately 72 times per minute of our lives. The heart pumps the blood, which carries all the vital materials which help our bodies function and removes the waste products that we do not need.The development of the heart can be broken down into three main stages the formation and development
In the process of gastrulation, the heart tube forms. For humans, this stage begins in the third week of conception. “At this stage, the developing heart itself consists of a plate of pro myocardial cells. The cardiac plate is positioned inferior to the presumptive pericardial cavity, which has arisen as a space within the mesoderm.”(From Conception to Birth)With continuing folding of the disc, this heart forming region is moved into the developing neck of the
The aorta artery forms. The formation of the aorta the most important artery in the body. This artery is the one that dill every all the blood pumped by the left ventricle. This happens when The outlet component of the primary heart tube, extending from the distal part of the ventricular loop to the distal extent of the pericardial cavity where it joins the aortic sac, is initially a structure with exclusively myocardial walls, and with distal and proximal parts separated by a characteristic bend. Due to processes as yet undetermined, the walls of the distal outflow change rapidly from this myocardial phenotype to an arterial one . Concomitant with the changes, the initially solitary tube seen distally is replaced by the intrapericardial portions of the ascending aorta and the pulmonary trunk. The proximal part also separates into two components, again losing its myocardial phenotype, with the arterial valvar leaflets and their supporting arterial sinuses formed just proximal to the bend, which marks the site of formation of the definitive sinotubular junctions . The most proximal part of the outflow tract is then itself separated by fusion of the cushions within it, new myocardium forming within the cushions to produce the medial part of the subpulmonary infundibulum, which retains its origin from the right ventricle. “At the same time, the subaortic part of the outflow segment is partitioned to the left