Viewing the Chambers At this point it is helpful to have two hands, one to hold the heart apart so you can take a peak inside of it and another to use a probe to locate the specific parts. With your fingers or probes in the aorta and the pulmonary trunk you should notice that they criss-cross each other, with the pulmonary trunk in the front.
Locate the Aorta Use your fingers to probe around the top of the heart. Grab some colored pencils to help you identify and mark the vessels you find.
The majority of the time, these vessels are not visible because the aorta was cut too close to the main part of the heart when the heart was removed from the animal. If you find the pulmonary vein, the aorta should be situated a little bit behind it. Four major vessels can be found entering the heart: This picture was on the board the day of the dissection so that you could glance up and recall which vessel entered which part of the heart.
On the left side, you should be able to find the opening of the pulmonary vein as it enters the left atrium. You can also now see how much thicker the walls of the left ventricle are compared to the right ventricle. Insert your finger through the pulmonary vessel to feel the left ventricle and you will notice and feel that it is much thinner than the left side of the heart.
Finding the vessels is directly related to being able to orient the heart correctly and figuring out which side you are looking at.
The pulmonary trunk is the located at the front of the heart and enters at an angle. The valves were probably cut when the heart was opened, but if you follow the "cords" they should lead you to a thin flap that is the atrioventricular bicuspid valve.
The left ventricle has a very thick wall, unlike the right ventricle. The other obvious structures seen within the heart are the chordae tendinae which are attached to papillary muscles.
Again, use your fingers to feel around the heart to find the openings. Make the Incisions Now that you have all of the vessels located and marked, you can now open the heart to view the inner chambers. Orientation When you first remove your heart from the bag, you will see a lot of fatty tissue surrounding it.
This means that you really must experience the heart with your hands and feel your way to find the openings. Heart Dissection Walk Through The heart dissection is probably one of the most difficult dissections you will do.
Many people will be squeamish about this, and because the heart is slippery, it is easy to drop. For instance, the aorta pencil can now be seen ending in the left ventricle.
Optionally, you may cut the heart in half to expose the chambers. Use the superior vena cava and pulmonary vein as guides for where to cut. The heart is also difficult because the fatty tissue that surrounds the heart can obscure the openings to the vessels.
Push your finger all the way in and you will feel inside of the left ventricle. It may be covered by fat, so use your fingers to poke around until you find the opening. You are basically going to be cutting each side of the heart so that you can look inside. You can find a similar valve on the right side of the heart tricuspid.
Remember that if you are looking at the back of the heart, then the right and left sides are the same as your right and left hand. The first image shows the front side of the heart, often identified by the coronary sinus that runs cross it at an angle yellow.
The heart below is marked to show you where the two incisions should be made. Image shows the left atrioventricular valve bicuspid and the chordae tendinae.
There are three vessels that branch from the aorta: This picture shows all of the vessels labeled. There are a few clues to help you figure out the left and the right side, but often the packaging and preserving process can cause the heart to be misshapen.Explain what you learned from the online human heart dissection.
I must truthfully state that I did not gain any new information from this exercise. I have been an RN for almost 40 years and my primary area of practice is critical care. Explain what you learned from the online human heart dissection.
I learned how big the heart is; I never thought that it was that big.
I learned where the pulmonary veins are located and where each ventricle is located in the heart. Explain What You Learned From The Online Human Heart Dissection. 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. Human Biology Lab Online, BIOL Lab 6 - Cardiovascular System Lab Six is on the "Cardiovascular System ".
In this lab, you will study the external and internal anatomy of the heart via virtual dissection of a sheeps heart. You will also investigate how the blood flows through the heart throughout the body.
B. Explain what you learned from the online human heart dissection. I learned that the heart is not perfectly symmetrical as it looks in the pictures. It is cone shaped, more hollow and about the size of an adult fist. B. Explain what you learned from the online human heart dissection.
I learned on the online human heart dissection how the heart blood flows works, the anatomy, the four valves, four chambers both left and right (two atriums and two ventricles) structures operate, muscle structures, ridges of the ventricles and septum, and the lungs work .Download