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It is located between the lungs and behind the breastbone. Normally, it is on the left side of the chest and its pumping can be felt by placing the hand above the area. The main function of…
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ANSWERS of the Human Heart The heart is a hollow muscular organ, cone shaped and size of an adult human closed fist. It is located between the lungs and behind the breastbone. Normally, it is on the left side of the chest and its pumping can be felt by placing the hand above the area. The main function of the heart is to supply blood throughout the body, supplying oxygenated blood to the muscles and drawing deoxygenated blood.This is a process necessary for respiration and for the cells of the body to function properly. Interestingly, the heart has three linings, the softer innermost layer called the endocardium, the middle region called the myocardium and outer fluid filled surrounding called the pericardium. The pumping of the heart is controlled by the Sino atrial (SA) node that is located in the posterior wall of the right atrium(Heart 1995).
To understand how the heart is able to perform its task of supplying blood, we should be able to note the main important parts.
1. Chambers of the heart: the heart contains four chambers, the right and the left atrium and the left and right ventricle. These are the sites where blood collects throughout the process.
2. The valves: there are two types of valves the Atrioventricular valves (located in the middle of the heart between the ventricle and the atria) of two types the tricuspid on the right and mitral/cuspid on the left and the Semilunar valves of two types pulmonary and the aortic valve. The functions of the valve is too prevent the backflow of blood to the chambers.
3. The vessels: There are four main vessels in the heart; the vena cava divided into superior and inferior, the pulmonary artery, the pulmonary vein and the aorta. The functions of veins is to covey blood from and to the heart.
How the Heart Works
The heart is divided into four chambers: the top two chambers are known as the atriums and the bottom two chambers are called ventricles. Importantly, the atriums both contract at the same time same as the two ventricles(Heart 1995). First and foremost, deoxygenated blood enters the heart via the superior and the inferior vena cava into the right atrium. The right atrium contracts and forces the blood to rush into the right ventricle through the tricuspid valve. Consequently, when the right ventricle contracts, the deoxygenated blood is pumped into both lungs through the pulmonary arterypast the semi lunar valves(Heart 1995). The process continuesas the blood is returned from the lungs via the pulmonary veins wherethe oxygenated blood is delivered to the left atrium. When the atrium contracts the blood is rushed through the valves into the left ventricle, thestrongest and most muscular portion of the heart.When the left ventricle contracts, blood is rushed through the aorta: he aorta is the main artery leaving the heart (Lewis 1925).
Through this process, oxygenated blood is now taken throughout the body through a series of arteries that gradually reduce becoming smaller and smaller. The oxygenated blood flows from arteries into arterioles then from arterioles into capillaries. This is the point when the blood is able to make close contact with individual cells and also the waste products are picked up and oxygen is delivered.
After delivery of the oxygenated blood and picking of wastes like Carbon IV oxide, the return trip to the heart starts; from the capillaries the blood flows into venules from venules to veins (The veins all return blood either into the superior or the inferior vena cava). From this point the deoxygenated blood is taken to the heart and the cycle continues (Lewis 1925).
In conclusion, the heart is simply the most important organ of the body and its ability to function well and never getting tired is due to the myogenic cells of the cardiac muscles. This means that as long as the heart is healthy, it is going to perform its functions to maximum capability. Lastly we should take good care of ourselves and get regular heart checkups to ensure that its healthy, this way we are going to lead a healthy life(Heart 1995).
Heart, L. (1995). The human heart: a living pump.. Bethesda, Md.?: National Institutes of Health, National Heart, Lung, and Blood Institute ;.
Lewis, T. (1925). The mechanism and graphic registration of the heart beat (3d ed.). London: Shaw. Read More
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