Have students gather coloring worksheets 50,51, and 52, dissection trays, pins, pins with flags for labeling the parts, dissection scissors, scalpels, forceps, and cow heart. Hand each student a copy of this lab sheet.
Dissection of the Heart:
50 minutes
Activities:
1. Working in pairs, students identify the parts of the heart using the coloring sheet plate 52. and this includes but is not limited to the 4 chambers, the aortic arch, the apex, the coronary arteries, and the cardiac veins as well as identifying and realizing the importance of the left side and the right side of the heart which are opposite of their left and right hands when looking at the heart.2. Place the heart in the tray anterior side up and the apex closest to you with the aortic arch away from you.
3. With the scalpel, slice the heart from left to right horizontally so that all chambers will be open to examine and the top is separated from the bottom.
4. Identify the parts of the heart that are listed on plate # 50 of the coloring book.
5. Flag these parts of the heart with the flag pins and label them.
6. Notice that the right ventricle is much larger than the left. This is because the right ventricle pumps blood throughout the body and the left ventricle only has to pump the blood to the lungs.
7. Identify which side of the heart deals with oxygenated blood and which side deals with deoxygenated.
8. Note the thickness and strength of the ventricles compared to the atria. Account for this.
9. Why do you think that the right side has 3 valves, tricuspid and the left only has two?
10. Notice how the valves open only one way.
11. After the teacher has checked your heart and the flags you placed, clean up your area and store your specimen in the bag. Label the bag with your names and refrigerate for use tomorrow.
12. Wash the tables and tools and return the tools to the tray.13. Below, and on the back, document your experiences today in a short paragraph. Watch your grammar. Also make a list of things that were difficult for you and any suggestions that you have to make them easier.
14. Be sure to complete the lab rubric. Be honest.
15. Visit the Virtual Anatomy interactive site or the HSTA Ask the Experts! site