Biology 10/31



Heart anatomy and blood vessels lab (Labs 35 and 37)Do all of the following figures in exercises 35 and 37. You do not have to label any exercise figures that are not listed below.AnswersYou are not required to do any of the assessment exercises. However, it is good practice to do them to check that you learned the concepts. Lab 35Figure 35.1: Skip blank 9See textbook Figure 13.8a for the answers.Figure 35.2: Label all blanks.See textbook Figure 13.8b for the answers.Figure 35.3: Label all blanks.See textbook Figure 13.4 for the answers.Assessment A: Skip questions 7, 9, and 10Assessment B: Skip questions 1, 2, 3, and 4Critical thinking applicationSheep Heart Dissection Procedure:The procedure for the dissecting the sheep heart is given below. Use this procedure instead of the one in your lab manual. Use figure 35.5 in the lab manual as a guide. See laboratory manual Figures 35.5 and 35.6 for exterior of the heart labels and text figures 13.4 for interior structure labels. Step:Procedure1Everyone in your group should put on gloves. Obtain a sheep heart and lay it in your dissecting tray. Also obtain a dissecting kit, 7 labeling pins with masking tape, and a glass rod to use as a probe.2In living creatures, the heart is surrounded by a fluid-filled serosa membrane called the pericardium. Use a scalpel and scissors to remove the pericardium if it is present. Also, trim the fat and vessels at the top of the heart until it looks like the figure one the next page.31755715A few notes about the heart: (a) The tops of the atria appear as brown flaps. These flaps are called auricles.(b) On the front of the heart, the largest coronary arteries are diagonal, but on the back of the heart, the largest ones run straight up and down. 3Do not cut open the heart yet. The first group of labeling pins go on the outside of the heart. Use lettered pins (A - G) to mark the heart structures listed below. It may be helpful to inspect the heart model on the front desk to identify some of these structures. ? A = Aorta (Hint: Usually in the middle of the base of the heart (the base is the top of the heart. Confirm your identification of the aorta with the glass probe. A glass probe inserted into the aorta goes all the way down into the left side of the of the apex of the heart)? B = Pulmonary trunk (sometimes called the pulmonary artery) (Hint: It crosses diagonally in front of the aorta. Confirm your identification of the pulmonary trunk with the glass probe. A glass probe inserted into the pulmonary trunk goes down into the right side of the heart)? C = The left atrium (Hint: Its outside appears as a dark flap called an auricle, usually located on the heart’s anterior side.)? D = The right atrium (Hint: Its outside also appears as a dark flap called an auricle, usually located on the heart’s posterior side)? E = Pulmonary vein (Hint: It appears as a small opening in the left atrium. Confirm your identification with the glass probe. A glass probe inserted into the pulmonary vein goes into the left atrium.) ? F= Superior vena cava (Hint: It appears as a small opening in the right atrium. Confirm your identification with the glass probe. A glass probe inserted into the superior vena cava goes into the right atrium.)??G = Any coronary artery (Hint: Any of the branching arteries on the surface of the heart)Bring heart to instructor to inspect your pins before starting step 4.4Use a scalpel to cut the heart as shown on the figure below. This cut should start at the left atrium (left auricle), cutting it in half, and then keep cutting all the way down to the apex of the heart, cutting the left ventricle in half. 9753596350Remove the portion of the heart that you have cut off. Inspect the chambers and valve inside the cut area of the heart. Label the structures listed below with pins and show them to your instructor.? A = Left atrium? B = Bicuspid valve*? C = Chordea tendinae*? D = Left ventricle* The bicuspid valve is the left AV valve. It is sometimes also called the mitral valve. The chordea tendinea are anchors for the AV valve.(The right chambers of the heart look identical to the left chambers, so we will not dissect into those chambers). 5When done, wash and return all equipment to where you obtained it. Dispose of the heart in the proper biohazard waste container.Lab 37Figure 37.1: Label all blanks.See textbook Figure 13.17 for the answers.Figure 37.4: Skip blank 6.See textbook Figure 13.27 for the answers.Figure 37.5: Skip blanks 1 – 4 and 6.See textbook Figure 13.28 for the answers.Figure 37.7: Skip blanks 2, 3, and 6.See textbook Figure 13.30 for the answers.Figure 37.8: Skip blanks 2, 3, 4, 6, 8, and 9.See textbook Figure 13.31 for the answers.Figure 37.9: Skip blanks 1 and 4. See textbook Figure 13.32 for the answers.Figure 37.12: Skip blanks 3 and 4 and 6. See textbook Figure 13.35 for the answers.In addition to the above, make labeled sketches from the two microscopes on the side counter.a) Microscope A is a close up of an artery. Sketch label the artery and label the lumen, the tunica interna, the tunica media, and tunica externa. Use lab manual figures 37. 1 and 37.2 as guides. 622935132080b) Microscope B is a close up of a vein. Sketch and label the vein and label the lumen, the tunica interna, the tunica media, and tunica externa. Use lab manual figures 37. 1 and 37.2 as guides.73723550800Assessment A: Skip questions 4, 5, 8, and 9Assessment D: Skip questions 1 – 4, 7 – 9, and 11Assessment E: Skip questions 1, 2, 5, and 7Assessment G: Skip blank 5 ................
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