The Heart Essay example

1462 WordsFeb 26, 20136 Pages
Cardiovascular System: The Heart Purpose Explain why you did this exercise. Where there any safety precautions you needed to follow? If so, what were they? The safety precautions in this exercise were to wear goggles and gloves due to being exposed to chemicals and dissection of the sheep and cat heart. Appropriate work space was also required. Exercise 1: Microscopic Anatomy of Cardiac Muscle Observations Sketch and label your slide in the space provided. Include a description of the structures you observed on the slide. See attached picture labeled cardiac muscle Questions A. What are…show more content…
The sheep heart has thicker walls and layers in the right and ventricle. Most of the internal structures are similar in both cat and sheep heart except for ligaments connecting the pulmonary artery to the aorta that is observed in the cat heart only. B. Why is the heart referred to as a double pump? It is referred as a double pump because it has two separate circuits, the pulmonary circuit pumping deoxygenated blood to the lungs and back to the heart and the systemic circuit pumping oxygenated blood around the body. C. There are four valves in the heart. Name each valve, list its location and give its function. Tricuspid valve - located between the right atrium and the right ventricle. Pulmonary valve - located between the right ventricle and the pulmonary artery. Mitral valve - located between the left atrium and the left ventricle. Aortic valve - located between the left ventricle and the aorta. The valves prevent the backward flow of blood. Valves have flaps that act as one-way for blood coming into a ventricle and one-way for blood leaving a ventricle. Each valve has three flaps, except the mitral valve, which only has two flaps. As the heart muscle contracts and relaxes, the valves open and shut, letting blood flow into the ventricles and atria at alternate times. When the left ventricle relaxes, the aortic valve closes and the mitral valve opens, to allow blood to flow from the left atrium into the left

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