write the parts and function of heart
Answers
Answer:
The heart has four chambers:
The right atrium receives blood from the veins and pumps it to the right ventricle.
The right ventricle receives blood from the right atrium and pumps it to the lungs, where it is loaded with oxygen.
The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle.
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Structure and Function of the Heart
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Gaea Marelle Miranda, M.Sc.
By Gaea Marelle Miranda, M.Sc.
Reviewed by Dr. Tomislav Meštrović, MD, Ph.D.
As a central part of the circulatory system, the heart is primarily responsible for pumping blood and distributing oxygen and nutrients throughout the body. Because of this task, the heart may be considered one of the most important organs of the body, such that even small dysfunctions or abnormalities may cause drastic changes or effects in the human organism.
The heart is a muscle whose working mechanism is made possible by the many parts that operate together. The organ is divided into several chambers that take in and distribute oxygen-poor or oxygen-rich blood. These chambers are accompanied by veins and arteries that facilitate the same function. With all of its parts working together towards the same goal, the heart successfully pumps blood with ease.
Normally, a good-functioning adult heart could go on three cardiac cycles or 72 beats per minute—this rate changes for children whose heart rates are normally and relatively faster.
Structure of the heart
The heart can be found at the chest's center, underneath the sternum in a thoracic compartment. It comprises four chambers and several valves that regulate the normal flow of blood within the body.
Two chambers called atria are located in the upper portion of the heart and receive oxygen-free blood. The valves that separate these chambers are called atrioventricular valves, composed of the tricuspid valve on the left and the mitral valve on the right.
On the other hand, ventricles are chambers found on the lower portion of the heart; they pump oxygen-enriched blood into the body's organs, reaching even the smallest cells. Similar to the atria, valves also separate the ventricular chambers. Collectively-termed as semilunar valves, these are comprised of the pulmonary and aortic valves.
Easy to edit vector illustration of anatomy of heart. Image Credit: Snapgalleria / Shutterstock
Easy to edit vector illustration of anatomy of heart. Image Credit: Snapgalleria / Shutterstock
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The heart also has a wall that is composed of three layers: the outer layer epicardium (thin layer), the middle layer myocardium (thick layer), and the innermost layer endocardium (thin layer). The myocardium is thick because it is made up of cardiac muscle fibers.
The heart structure is made more complex because of the mechanisms that allow blood to be distributed throughout the body and return to the heart. Facilitating this continuous process are two types of blood vessels: veins and arteries. The vessels that bring oxygen-free blood back into the heart are called veins; those that bring oxygen-rich blood away from the heart and to other body parts are called arteries. Functioning in the left ventricle, the largest artery is called the aorta. The aorta is considered a main artery in the body. It further splits into two smaller arteries called common iliac arteries.
With regular functioning, the heart can continuously supply a sufficient amount of oxygen to all parts of the body.
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