The Human Heart

By | March 29, 2016

A persons heart is one of the most significant organs in their body. It can be considered basically a pump which is composed of muscles that pump blood throughout the body. It can be fist-sized and beats about seventy times each minute. One’s heart has chambers, veins, arteries, valves and a complex muscular system which allow it the ability to function.

Why do the heart pump blood?

The heart pumps blood abundant with oxygen and vital nutrients to varied parts of the body and removes co2 and waste products from the body different systems. As an example, your brain needs glucose and oxygen exactly like other body organs. If the supply is interrupted, the brain will lose its ability to function properly. Muscles need glucose, proteins, and minerals like potassium, calcium and sodium in order to function normally. The glands have to have a constant way to obtain specific materials as a way to make their respective secretions. If the heart stops pumping blood, one of the first organs that will be affected is the brain usually within 4-6 minutes followed by a gradual shutdown of all the other bodily systems.

Components of one’s heart

The 4 hollow section of the heart are called chambers, and the walls are made up of three layers. The top chambers are called artia whilst the lower chambers are called ventricles. There are two upper left and right chambers and there are two lower right and left chambers. Subsequently, the heart has four chambers the left and right atria, as well as the right and left ventricles. Everyone of the four chambers must contract or relax in the proper sequence in order for the heart to work properly.

The right atrium receives blood from the upper and lower body from the superior and inferior vena cava. The right ventricle pumps blood to the lungs from the pulmonary artery were the blood can be re-oxygenated. On the left side, the atrium receives oxygenated blood through the lungs from the pulmonary vein. The left ventricle pumps blood throughout the body through the aorta.

The heart has valves throughout the heart that ensure blood flows one way only, for example from the atrium to the ventricle. These valves allow the correct quantity of blood to circulate from the atrium to the ventricle for example and once the specific quantity of blood is pumped from the atrium to the ventricle the valve close to prevent backflow in between beats.

Again they stop the blood flowing from the atrium towards the ventricle from flowing backwards into the atrium. The key valve we are talking about on the right side of the heart is call the tricuspid valve.

The Sinoatrial node is a group of cells located in the right atrium and they are referred to as the pacemaker. When it sends out an electrical signal telling the heart to contract starting in the atrium and then throughout the heart blood move from the atrium to the ventricle in other words all four chambers contract at the same time.

The signal reaches the other chambers through the atrioventricular node, where it decelerates before reaching the ventricles.

The cycle of the heart

So a quick refresher the blood entering the right (R) atrium from the inferior and superior vein is deoxygenated blood filled with carbon dioxide. From the atrium it goes to the R ventricle to the lungs for oxygenation, and from there it goes to the R atrium to the R ventricle where it’s pumped out to the body.

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