Mariana Calle Cano—Science Lab Write-up
Heart Dissection Experiment-7.3
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Purpose
The purpose of this heart dissection lab is to observe the heart physically,
learn from it, and learn how it’s actually made.
Procedure:
1. Prepare the materials that are required for the dissection; gloves,
tray, cutting objects, etc.
2. When you receive you heart without opening it, locate the small
parts of the heart that were studied in class.
3. Using a scalpel and scissors cut the heart open in order to identify
the different parts.
4. When opening the heart you will find the aorta, the chambers the
atria and ventricles. You will also find the right atrium and the
superior vena cava.
5. After you have done this started looking in the heart for the valves
and then after you have found them look for the heart strings or
Cordae Tendinae.
6. Last find the Septum or the wall that divides the ventricles, last
compare the ventricles.
7. After you complete the required process, continue to examine the
different heart parts with your group.
8. Clean up; throw the left over heart pieces on the red garbage
can. Rinse the cutting devices, throw away the used gloves and
clean up your area!
Data
1. Ascending aorta
2. Superior Vena Cava
3. Right pulmonary artery
4. Right pulmonary veins
5. Right atrium
6. Tricuspid valve
7. Right ventricle
8. Inferior Vena cava
9. Pulmonary artery
10. Pulmonary veins
11. Left atrium
12. Biouspid valve
13. Aortic valve
14. Left ventricle
15. Descending Aorta
Pig Heart Pictures
Results
My group did an amazing job while dissecting the heart. While we were
dissecting the heart we were able to find all of required parts with the
exception of the tricuspid valve, the right pulmonary arteries, the
descending aorta and ascending aorta.
During the development of the dissection it was practical for my group
to make all of the incisions in the heart. We followed the procedure to
dissect the heart correctly. Some of the things that were hard for my
group are that we had trouble while we were trying to find the required
parts to be identified; it was difficult for my group to tell them apart. We
can conclude that my group was able to follow all of the procedure
steps. In my group we were very careful while dissecting; that is the
reason why we had enough time to complete the procedure
accurately.
Questions
1. Right atrium: receives oxygen-depleted blood from the superior
vena cava and the inferior vena cava. Pumps it through
the tricuspid valve into the right ventricle.
Right ventricle: receives oxygen & blood from the right atrium and
pumps it through the pulmonary valve into the lungs
Left atrium: receives oxygen-rich blood from the lungs via the
pulmonary veins and pumps it through the mitral valve into the left
ventricle.
Left ventricle: receives oxygen-rich blood from the left atrium and
pumps it through the aortic valve to the entire body via the aorta,
including to the heart muscle itself through the coronary arteries.
2. The 2 chambers that pump blood are the left ventricle and the left
atrium and the 2 chambers that collect blood are the right
ventricle and the right atrium.
3. There are four heart valves in a healthy human heart. The valves
help maintain proper blood flow through the heart, keeping blood
moving efficiently and smoothly, and in the right direction. In
addition to the valves there are four heart chambers -- the upper
chambers are called the left and right atrium, the lower chambers
are the left and right ventricle.
4. The mayor arteries are the aorta and the pulmonary artery and the
major veins connected to the heart are the superior and the inferior
vena cava.
5. All the cells in your body need oxygen, and blood is the carrier that
brings oxygen around to every part of your body. It needs to keep
coming back to the lungs so hemoglobin molecules in the blood
can get refilled with more oxygen. The lungs are where gas
exchange takes place. Carbon dioxide from your blood leaves
and oxygen enters into the blood. Therefore if the lungs don't have
a blood supply there would be no way for a person to get rid of
carbon dioxide or acquire oxygen.
6. The walls of the ventricles are thick because they must be strong to
push blood away from the heart and through the body. The wall
that lines the ventricle is called the interventricle wall. In contrast
to the thick walls of the ventricles. The atria are thinner, and are
lined with what are called pestinate muscles. These muscles
resemble lattice and line the interior wall. The atria's thinner walls
when compared to the ventricles are directly related to its function:
blood flows into the atria, and very little force is needed (and
therefore less heart muscle in the walls) to propel the blood to the
atria.
7. The aorta is the largest artery in the body, from the left ventricle of
the heart and it extends down to the abdomen, where it breaks off
into two smaller arteries. The aorta distributes oxygenated blood to
all parts of the body though the systemic circulation.
8. Blood with no oxygen enters the heart the Inferior Vena Cava,
Superior Vena Cava, & Coronary Sinus - Right atrium- Tricuspid
valve -Right ventricle -Pulmonary valve - Pulmonary trunk -Left and
Right Pulmonary Arteries - Lungs - Oxygenated blood reenters the
heart via the Left and Right Pulmonary Veins - Left atrium - Left
ventricle - Aortic valve -- Ascending Aorta - Descending Aorta