The Human Heart : The Embryology Of The Heart

The left side of the heart was bigger than the right side. This is because the left side of the heart, has the job of pumping the blood to all the body. The right side of the heart is smaller as it has only one job, which is to pump blood to the lungs. The atrium are very flimsy in comparison to the ventricles. The atria are small and flap like because it collects blood, whereas the ventricles actually pump the blood, so they are stronger muscles. This was why they were large and took up most of the room in the heart. There were two arteries coming out the top of the heart. These are the aorta and the pulmonary artery. Their elastic walls are very thick so that they can withstand high levels of blood pressure.

The fetal pig heart and the sheep heart were very similar in structure. They both consist of two atria and two ventricles. The biggest difference noted between the fetal pig and the sheep hearts were the size. The sheep heart was larger than the pig, although the pig heart seemed to have thicker myocardial muscles.

How does the structure of cardiac myocytes and intercalated disks follow the function of cardiac muscle tissue

R E V I E W S H E E T 30 Anatomy of the Heart

If the heart and its chambers aren't formed correctly prior to birth, the healthy parts have to work all the harder.

Oxygen and nutrients the body requires for function are pumped around this complex network of blood vessels by the heart. At roughly the size of a human fist, the heart is a four-chambered muscle and performs two functions of circulation simultaneously and continuously. Systemic and pulmonary circulation. The heart is made up from three separate layers of cardiac tissue; the outer layer called the pericardium, which is a double sac-like outer covering with serous fluid inside to keep the middle layer, the myocardium from adhering to the outer layer. This middle layer of the heart is the heart muscle which is thicker on the left side, to aid with the pressure needed to sustain systemic circulation. The inner layer of the heart is the endocardium. It’s lining is smooth to help prevent the blood which circulates around the inside of the heart from clotting. The heart is the human body’s in-built pacemaker, and the electrical signals sent through the it cause the heart to contract and relax. This process is triggered by the autonomic nervous system and the contraction and relaxing cycle is

The heart consists into three layers in which are endocardium, the myocardium, and the epicardium. The endocardium is the inner layer of the heart (chambers and valves). The myocardium is the middle muscular layer which is responsible for heart contraction. The epicardium is the outside layer of the heart

Located between the parietal and visceral layer is the pericardial fluid, this is emissions of pericardial cells that helps reduce friction between layers as the heart moves and thumps. The heart has three layers; the epicardium (made up of two tissue layers the visceral layer and serous pericardium layer). This layer of the heart is made out of mesothelium which is a thin transparent layer that is a delicate fibroblastic tissue and adipose tissue. This adipose tissue starts to get thickest over ventricular surfaces where the hearts coronary and cardiac vessels are found. The center layer of the heart is the myocardium (this layer is in charge of the pumping activity of the heart and is made out of cardiovascular muscle). The myocardium consists of ninety-five percent of the hearts wall, which consists of muscle fibers. The cells in the myocardium layer are muscle strands. The cardiovascular muscle fibers structure bundles and whirl slantingly around the heart which is in charge of the heart 's pumping activity. The internal layer of the heart is the endocardium (this is a flimsy layer of endothelium tissue overlying a thin layer of connective tissue). This layer gives a smooth coating layer to the chamber of the heart and spreads the valves of the heart. This smooth layer lessens friction as blood moves all through the heart. The endothelium and endocardium have large veins that connect to the heart. The heart is four chambers; two

The normal flow of blood through the heart consists of the entry of blood to the right atrium through to the right ventricle and then the blood passes through the tricuspid valve entering the lungs and then through to the left atrium and to the left ventricle via the mitral valve and finally into the body. During fetal development, however there are the risks for congenital anomalies. These congenital heart disorders consist of Atrial septal defect (ASD) and Ventricular septal defect (VSD). ASD is one of the common congenital heart defects that requires interventional measures or repair. The condition occurs when the foramen ovale the opening between the atria prior to birth does not close and there

The heart is a muscular four-chambered organ whose primary purpose is to pump blood throughout the body. The heart is the first functioning organ in the embryo. Its first pulsatile movements begin during the third week after conception. This early development of the heart is essential to rapidly growing embryo as a means of circulating nutrients and removing waste product. Most of the

    According to parents.com, after conception, a fetus begins to develop rather quickly. In the fifth week of pregnancy, a baby’s heart begins to beat. A baby also develops three distinct layers, ectoderm, endoderm, and mesoderm. These three layers will eventually form the body systems that are necessary

The left ventricle’s pumping capacity is controlled by the heart’s conduction system which is regulated by the nervous system. This conduction system is a series of electrical impulses that begin in the right atrium with the sinoatrial (SA) node and cause the right and left atria to contract first. This electrical impulse then travel by way of special tissue to the atrioventricular (AV) node, which is located between the atria and the ventricles. At the AV node the electrical impulse pauses very briefly to allow the ventricles to fill with blood. After the pause, the electrical impulse travels through the bundle of his and through right and left bundles that branch into the right and left ventricles respectively. These bundles branch into the Purkinje fibers which are attached to the cells in the walls of the ventricles. The electrical impulses move across the cells on the walls of the ventricles; thus signaling the ventricles to contract with the left

6. Automaticity – ability of heart to beat spontaneously and repetitively without external neurohormonal control. The heart is capable of beating outside the body, given proper laboratory conditions. Automaticity is evidently linked to fluid and electrolyte balance rather than to nervous system control.

Surrounding each of these valves are dense fibrous rings or annuli made of connective tissue that forms the cardiac skeleton. The annuli of the aortic valve forms the base for the other annuli as it is located central to the other valves. Fibrous extensions from the annuli of the aortic valve extends outwardly and anchors the other three valves. In addition to the four annuli there are other fibrous components of the cardiac skeleton such as the right and left fibrous trigones, and the membranous septum. The right fibrous trigone is also know as the central

5. In which of the following the heart is less specialized having no partitions and absence of spiral valves from conus? a) Protopterus b) Lepidosiren c) Neoceratodus d) None 6. A single lung is present in: a)