Sheep Heart Dissection Lab Report

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BIO 1100 Laboratory (Fall 2017)
Laboratory Exercise #5
Sheep Heart Dissection

Why dissect a sheep heart?
Like you, sheep have a four-chambered heart. By studying the anatomy of a sheep's heart, you can learn about how your own heart pumps blood through your body, keeping your cells and tissues supplied with nutrients.

Blood flow through a mammalian heart:
As you examine the sheep heart, keep in mind the pattern of blood flow through it. Remember that deoxygenated blood returning from the body enters the right atrium via the anterior vena cava and posterior vena cava. The anterior vena cava returns blood from the upper extremities and cranium. The posterior vena cava returns blood from the lower extremities.
From the right atrium blood passes into the right ventricle via the tricuspid valve (right atrioventricular valve), and from there it travels to the lungs via the …show more content…
When the right ventricle contracts, blood is pumped through the pulmonary valve into the pulmonary artery and into the lungs. Blood now returns to the heart from the lungs through the pulmonary veins and goes into the left atrium. When the LA contracts, blood travels through the mitral valve (bicuspid valve) and into the left ventricle. The left ventricle pumps blood through the aortic valve and into the aorta and to the rest of the body.

YOU’RE THE PATIENT: Coronary heart disease (CHD) increases a person’s chances of having a heart attack. CHD is characterized by the build up of plaque inside the arteries of the heart. Plaque buildup can reduce/block blood flow to the heart. Coronary artery bypass grafting (CABG) is a procedure used to treat CHD. Assume you were diagnosed with CHD and your physician recommended CABG. Before deciding to have the surgical procedure, you spent time researching CABG. What did you find out in terms of how this procedure works to improve blood flow to the
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