The Sheeps Center Dissection Physical Education Essay

To dissect and see a sheeps heart in order to understand the anatomy of the human being heart, to tell apart between the still left and the right aspect of the heart and the constructions of the ventricles and the atriums also to recognise the blood flow through the several types of blood vessels in the heart and soul and its goal.

The heart and soul is a major organ found in the thoracic cavity in mediastinum with the functions of pumping oxygenated blood around body. It consist of special muscles known as the cardiac muscles which are known as myogenic credited its ability to stimulate its own contractions using electrical power impulses created by the Sino atrial node (SAN also called the pacemaker), atrioventricular node and the purkinje fibres hence any stimulus from the nervous system. The center muscle is very amount of resistance to fatigue. (Tharp et al, 2009).

Cardiovascular disease is the disease from the heart included in these are angina, coronary attack, cardiomyopathy, heart inability, heart valve disease and stroke. It is important that people learn the anatomy of the heart and soul as yearly the in number of instances with cardiovascular diseases increases significantly in undeveloped countries as well as developed countries. There are a number of factors that can raise the risk of cardiovascular diseases such as time, i. e. the aged you are the more chances of developing coronary disease increases, Making love, men will be more prone to cardiovascular disease than women at a young time, smoking, high blood circulation pressure, obesity, high blood cholesterol, stress, and ethnic history. (Kannal and McGee, 1979)

In order to avoid such diseases of the heart it is essential to maintain a wholesome life-style by controlling the dietary plan and doing sensible amount of exercise and reduce the variety of risk factors whenever you can. By executing a dissection of the sheep's heart the anatomy of the real human heart and soul can be described this can be found in the medical industry to gain a better understanding of the heart in order to help treat cardiovascular diseases. Sheep's heart and soul is cheaper and easily available and since it has similar anatomy compared to that of your human's center it is even far more convenient to see it.

Method

Materials: Dissecting scissors, scalpel, probe, sheep's center, dissecting tray

Before the heart and soul was incised using the hands, the four chambers of the heart and soul was felt to ascertain their sizes and the inner plans. A probe used to signify blood was placed through the aorta and its pathway was found as it leads into the left ventricle. While using scalpel the center was carefully incised from the aorta down the walls of the remaining ventricles or more the walls of the right ventricles. Open up the center to inspect the inner anatomy.

Using a probe the heart was implemented from the right atrium into the right ventricles through three slim flaps attached to white string like set ups known as the chordae tendinae this was recognized as the tricuspid valve. Moreover on the still left part of the heart there have been two skinny flaps accepted as the bicuspid valve. Through the left ventricles the probe was used to follow the flow of blood across the aorta where another group of thin half-moon shaped structures were spotted and determined as the aortic semi lunar valve. In the same way from the right ventricles the probe was used to check out the blood circulation over the pulmonary artery through the pulmonary semi lunar valve that was also seen.

Results

Figure 1 shows the external anatomy of the heart and soul. Superior end of the heart and soul in known as the bottom and the pointed end are called the apex. The proper and the remaining coronary arteries and veins is seen these arteries supply the heart and soul with oxygenated and nutrient packed blood. The arteries are also surrounded by excess fat tissue known as adipose.

Figure 1: External view of the center.

Figure 2: Deep trim view of the right area of the heart.

Figure 2 the right side of the heart and soul can be seen. The chordae tendinae and the tricuspid valve are also obvious combined with the papillary muscle as labelled. Major arteries like the vena cava (the top opening near to the right auricle) can be seen. The pulmonary artery and the pulmonary semi lunar valve are also noticeable. The Sino atrial node, atrioventricular node and the purkinje fibres however are not observable.

Figure 3: Drawn and labelled superficial image of the kept part of the heart and soul.

Discussion

During the dissection of the heart and soul the still left and the right area of the heart can be identified as the remaining side of the center has thicker ventricles than the right side. This is because of the fact that the kept ventricle must pump oxygenated blood around the complete body therefore the walls of the left ventricle must have the ability to exert ruthless to get over the systemic blood flow, whereas the right ventricle only must pump deoxygenated blood vessels to the lungs. How big is the walls of the atriums are less muscular than that of the ventricles this is due to the fact the atriums only pump blood vessels down to the ventricles therefore they do not need to create high pressure. (Hill and Laizzo, 2009)

The bicuspid and tricuspid also known as the atrioventricular valves are also noticeable combined with the pulmonary and aortic semilunar valves. The bicuspid and tricuspid valves are connected to string like buildings called the chordae tendinease which is linked to a lump of muscle on the sides of the walls of the ventricles. The starting and closing action of the valves are managed by the contraction and rest of the papillary muscle. For example when the blood vessels flows through the bicuspid valve also known as the mitral valve into the left ventricles the papillary muscles relax lowering the strain in the chordae tendinease allowing the bicuspid valve to start. After the right atrium surface finishes contracting totally and the left ventricle is filled up with blood the remaining ventricle agreements and pumps the bloodstream up to the aortic semilunar valve. Due to gravity there's a inclination for the blood vessels to back in to the ventricles because the set ups of the semilunar valves and the atrioventricular valves are umbrella enjoy it prevents the trunk blood circulation and ensures that the blood flows in one path only. (Wilcox et al, 2004)

When comparing the sheep's heart with that of a human it could be seen that they are both very similar in anatomy due mainly to the reason that they both have the same functions and purpose. That is expected because they are both mammals both hearts includes similar features such as four chambers left and right atrium and ventricles and the circulatory pathway of the blood vessels. The only apparent difference is the difference in proportions of both hearts. (Hill and Laizzo, 2009)

Although the entire dissection was successful there are many limitations that also have to be taken under consideration. The dissection of the heart and soul was not accurate by means of when the still left and the right part of the hearts were cut the delicate buildings inside were also slice accidently, this made it difficult to find some parts within the center. This could also be due to the fact that the heart is not symmetrical so it is hard to incise effectively. A proven way this dissection could be advanced gets a detail by detail demonstration on the heart and soul dissection.

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