The Sheeps Heart Dissection Physical Education Essay

To dissect and detect a sheeps bosom in order to understand the anatomy of the human bosom, to separate between the left and the right side of the bosom and the constructions of the ventricles and the atriums and to recognize the blood flow through the different types of blood vass in the bosom and its intent.

The bosom is a major organ located in the thoracic pit in mediastinum with the maps of pumping oxygenated blood around organic structure. It consist of particular musculuss known as the cardiac musculuss which are referred to as myogenic due its ability to excite its ain contractions utilizing electrical urges created by the Sino atrial node ( SAN besides known as the pacesetter ) , auriculoventricular node and the Purkinje fibres therefore any stimulation from the nervous system. The bosom musculus is really resistance to tire. ( Tharp et al, 2009 ) .

Cardiovascular disease is the disease associated with the bosom these include angina, bosom onslaught, myocardiopathy, bosom failure, bosom valve disease and shot. It is of import that we learn the anatomy of the bosom as every twelvemonth the in figure of instances with cardiovascular diseases increases dramatically in undeveloped states every bit good as developed states. There are a figure of factors that can increase the hazard of cardiovascular diseases such as age, i.e. the older you are the more opportunities of developing cardiovascular disease additions, Sex, work forces are more prone to cardiovascular disease than adult females at a immature age, smoke, high blood force per unit area, fleshiness, high blood cholesterin, emphasis, and cultural background. ( Kannal and McGee, 1979 )

In order to forestall such diseases of the bosom it is indispensable to keep a fitter life manner by commanding the diet and making sensible sum of exercising and cut down the figure of hazard factors every bit much as possible. By carry oning a dissection of the sheep ‘s bosom the anatomy of the human bosom can be explained this can be used in the medical industry to derive a better apprehension of the bosom in order to assist handle cardiovascular diseases. Sheep ‘s bosom is cheaper and easy available and because it has similar anatomy to that of a homo ‘s bosom it is even more convenient to detect it.


Materials: Dissecting scissors, scalpel, investigation, sheep ‘s bosom, dissecting tray

Before the bosom was incised utilizing the custodies, the four Chamberss of the bosom was felt to find their sizes and the internal agreements. A investigation used to stand for blood was inserted through the aorta and its tract was detected as it leads into the left ventricle. Using the scalpel the bosom was carefully incised from the aorta down the walls of the left ventricles and up the walls of the right ventricles. Open up the bosom to inspect the internal anatomy.

Using a investigation the bosom was followed from the right atrium into the right ventricles through three thin flaps attached to white twine like constructions known as the chordae tendinae this was identified as the tricuspid valve. Likewise on the left side of the bosom there were two thin flaps recognised as the bicuspid valve. From the left ventricles the investigation was used to follow the flow of blood along the aorta where another set of thin lunula shaped constructions were spotted and identified as the aortal semi lunar valve. Similarly from the right ventricles the investigation was used to follow the flow of blood along the pneumonic arteria through the pneumonic semi lunar valve which was besides seen.


Figure 1 shows the external anatomy of the bosom. Superior terminal of the bosom in known as the base and the pointed terminal are called the vertex. The right and the left coronary arterias and venas can be seen these blood vass supply the bosom with oxygenated and alimentary filled blood. The blood vass are besides surrounded by fat tissue known as adipose.

Figure 1: External position of the bosom.

Figure 2: Deep cut position of the right side of the bosom.

Figure 2 the right side of the bosom can be seen. The chordae tendinae and the tricuspid valve are besides seeable along with the papillose musculus as labelled. Major blood vass such as the vein cava ( the big gap near the right auricula atrii ) can besides be seen. The pneumonic arteria and the pneumonic semi lunar valve are besides noticeable. The Sino atrial node, auriculoventricular node and the Purkinje fibres nevertheless are non discernible.

Figure 3: Drawn and labelled superficial image of the left side of the bosom.


During the dissection of the bosom the left and the right side of the bosom can be identified as the left side of the bosom has thicker ventricles than the right side. This is due to the fact that the left ventricle has to pump oxygenated blood around the whole organic structure therefore the walls of the left ventricle must be able to exercise high force per unit area to get the better of the systemic circulation, whereas the right ventricle merely has to pump deoxygenated blood to the lungs. The size of the walls of the atriums are less muscular than that of the ventricles this is due to the fact the atriums merely pump blood down to the ventricles therefore they do non necessitate to bring forth high force per unit area. ( Hill and Laizzo, 2009 )

The premolar and tricuspid besides known as the auriculoventricular valves are besides seeable along with the pneumonic and aortal semilunar valves. The premolar and tricuspid valves are connected to threading like constructions called the chordae tendinease which is connected to a ball of musculus on the sides of the walls of the ventricles. The gap and shutting action of the valves are controlled by the contraction and relaxation of the papillose musculus. For illustration when the blood flows through the bicuspid valve besides known as the mitral valve into the left ventricles the papillose musculuss relax diminishing the tenseness in the chordae tendinease leting the bicuspid valve to open. Once the right atrium coatings undertaking to the full and the left ventricle is filled with blood the left ventricle contracts and pumps the blood up through to the aortal semilunar valve. Due to gravitation there is a inclination for the blood to endorse in to the ventricles because the constructions of the semilunar valves and the auriculoventricular valves are umbrella like it prevents the back flow of blood and ensures that the blood flows in one way merely. ( Wilcox et al, 2004 )

When comparing the sheep ‘s bosom with that of a human it can be seen that they are both really similar in anatomy chiefly due to the ground that they both have the same maps and intent. This is expected as they are both mammals both the Black Marias contains similar characteristics such as four Chamberss left and right atrium and ventricles and the circulative tract of the blood. The merely obvious difference is the difference in size of both Black Marias. ( Hill and Laizzo, 2009 )

Although the overall dissection was successful at that place are a few restrictions that besides need to be taken into consideration. The dissection of the bosom was non accurate by agencies of when the left and the right side of the Black Marias were cut the delicate constructions inside were besides cut accidently, this made it hard to turn up some parts within the bosom. This could besides be due to the fact that the bosom is non symmetrical so it is difficult to incise accurately. One manner this dissection could be improved is acquiring a measure by measure presentation on the bosom dissection.