Experiment-Heart Dissection(Complete)
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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Describe the process of this experiment.
Obtain a sheep’s heart. Identify the front or ventral surface which is more rounded. Place on a dissecting board with the ventral surface upright. Notice how the left side feels firmer as the left ventricle has a thicker muscle wall. If not removed by the butcher, the coronary vessel runs diagonally from left to right in front of the heart. Use a scalpel to make a shallow cut from the left ventricle to the left atrium parallel to the septum. Make a second incision 1cm away from and parallel to the first cut. Use your fingers to push open the heart at each incision to view the internal structures: 2 atria- smaller with thinner walls. 2 ventricles- bigger with thicker walls, left firmer. Bicuspid valve with 2 flaps. Tricuspid valve with 3 flaps. Semilunar valves are viewed from the aorta and pulmonary artery when cut open. Flag label using pins and paper, thee parts which are identified.
Name 2 safety precautions for this experiment.
Cut away from the body when using the scalpel. Wear a lab coat, goggles and gloves.
How did you expose the semilunar valve?
Cut open the aorta.
Where in the dissection did you find the origin of the coronary artery?
The base of the aorta.
What is the function of the semilunar valve?
To prevent backflow into the ventricles.
Cardiac muscle is described as contractile tissue, what does this mean?
It can shorten.
Where is the septum located?
Between the right and left sides of the heart.