On each side of the heart there is one atrium and one ventricle, thus referred to as the left atrium, left ventricle, right atrium and right ventricle.
To ensure that blood does not flow backwards, the heart uses several valves, limited in movement by the papillary muscle. The mitral and tricuspid valves are what allow blood to flow from the atria to the ventricles but not in the other direction. The tricuspid does this for the right side and the mitral for the left.
The other two valves work for the ventricles. The pulmonary valve makes sure blood continues in a forward motion through the pulmonary arteries and out of the heart. The aortic valve works for the left ventricle and also guarantees that blood stays on a forward path out of the heart. However, the blood leaving each of these places has a very different destination, to be discussed later. The final component of the heart is the septum.
The septum, from the Latin "saeptum," meaning a dividing wall or enclosure, does just that; it divides the right and left sides of the heart so the blood does not mix.
As mentioned above, there are two sides of the heart; a right side and a left side. Each side has a corresponding atrium and ventricle. The oxygen-poor blood then travels through the tricuspid valve to the right atrium, where it is pumped through the pulmonary arteries to the lungs. This is called pulmonary circulation. Once in the lungs, the blood undergoes a gas exchange by receiving oxygen and leaving behind carbon dioxide.
Now, the oxygenated blood travels through the pulmonary veins to the left side of the heart. The right cavity of the heart which is composed of the right atria and right ventricle receives deoxygenated blood from all parts of the body and pumps this blood to the lungs for oxygenation pulmonary circulation.
The left cavity composed of the left atria and left ventricle receives the oxygenated blood from the lungs and pumps this blood to all body parts through the aorta systemic circulation. The heart has four valves that regulate the flow of blood through its chambers.
Blood flow from the right atrium to the right ventricle is regulated by the tricuspid valve. The pulmonary valve regulates blood flowing into the pulmonary artery from the right ventricle. Oxygenated blood from the lungs passes through the mitral valve situated between the left atrium and left ventricle. The aortic valve regulates oxygenated blood flow from the left ventricle to the aorta for delivery to the body.
A heart attack occurs when the heart is not able to pump blood effectively due to arteries clogging. Deposition of fatty cells in arteries will lead to their constriction inhibiting the flow of blood leading to a heart attack which is fatal in most cases. Accessed September 15, We will write a custom essay sample on Human Heart specifically for you.
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ADVERTISEMENTS: The human heart is pinkish about the size of a fist and weighs approx. gms, the weight in females being about 25% lesser than the males. It is a hollow, highly muscular, cone-shaped structure located in the thoracic cavity above the diaphragm in between the two lungs.
- Human Heart Discuss the ways in which a novelist explores the condition of the human heart in a novel you have studied. In the novel “The great Gatsby”, the novelist F. Scott Fitzgerald explores the conditions of the human heart through relationships that occur in this story.
The human heart is slightly bigger than the size of ones fist. It is situated at a very safe place which is between the cage bones, i.e., in the center of the chest. Usually it is slightly on the left side of the chest but in rare cases, it can be found on the right side. The Human Heart The human heart has four chambers. On each side of the heart there is one atrium and one ventricle, thus referred to as the left atrium, left ventricle, right atrium and right ventricle.
The Human Heart Words | 4 Pages. The human heart is slightly bigger than the size of ones fist. It is situated at a very safe place which is between the cage bones, i.e., in the center of the chest. Usually it is slightly on the left side of the chest but in rare cases, it can be found on the right side. HEART The human heart is a specialized, four-chambered muscle that maintains BLOOD flow in the CIRCULATORY SYSTEM. Located in the thorax, it lies left of the body's midline, above and in contact with the diaphragm.