* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download lab practice: dissecting a cow`s heart
Survey
Document related concepts
Management of acute coronary syndrome wikipedia , lookup
Electrocardiography wikipedia , lookup
Quantium Medical Cardiac Output wikipedia , lookup
Heart failure wikipedia , lookup
Artificial heart valve wikipedia , lookup
Coronary artery disease wikipedia , lookup
Myocardial infarction wikipedia , lookup
Cardiac surgery wikipedia , lookup
Mitral insufficiency wikipedia , lookup
Arrhythmogenic right ventricular dysplasia wikipedia , lookup
Lutembacher's syndrome wikipedia , lookup
Atrial septal defect wikipedia , lookup
Dextro-Transposition of the great arteries wikipedia , lookup
Transcript
E= /6 The Victoria School MYP Year 4 April 29th 2013 LAB PRACTICE: DISSECTING A COW’S HEART Criterion Evaluated: E ATL: Thinking. Applying knowledge and concepts, including logical progression of arguments. The purpose of this activity is: Identify and compare the size, shape and tissue type of the mayor anatomic landmarks of the heart Associate the heart’s structure with its function. Materials Dissection kit Rubber/latex gloves Cow Heart Digital camera or cell phone with camera Pencils Dissection guide and results table Diagram of heart PROCEDURE (during the lab practice) SAFETY Take care with sharp dissecting tools and report any cuts to your teacher. Do not play with any of the materials you are given. At the end of the practical, disinfect the work area and wash your hands thoroughly using soap and plenty of water. LAB PRACTICE This lab practical allows you to identify and compare the size, shape and tissue type of the major chambers and vessels of the heart. The goal of the lab is not, however, just to observe anatomy, but to associate structure with function. The heart is a pump for blood that comes into the right atrium, goes out to the lungs through the right ventricle, returns through the left atrium, and leaves again through the left ventricle. Each chamber is separated by valves that prevent the backflow of blood. Try and figure out where the various components are, how each works, especially how the shape, composition, and even texture of each part contribute to its function. a b Check the look, feel and color of the heart. First, identify the right side and left side of the heart: Look closely and on one side you will see a diagonal line of blood vessels that divide the heart. The half that includes all of the apex (pointed end) of the heart is the left side. Confirm this by squeezing each half of the heart. The left half will feel much firmer and more muscular than the right side. (The left side of the heart is stronger because it has to pump blood to the whole body. The right side only pumps blood to the lungs). c d e f g h Identify the following parts of the heart: i. Right atrium and left atrium (if possible) ii. Right and left ventricle (lower chambers of the heart) iii. Coronary artery and vein (the diagonal line of blood vessels that divide the heart) iv. Aorta (artery leaving from the left side of the heart) v. Pulmonary artery (artery leaving from the right side of the heart) vi. Vena cava and Pulmonary vein (if possible) Locate the right atrium and make an incision down through the wall of the right ventricle. Pull the two sides apart and look for three flaps of membrane. These membranes form the tricuspid valve between the right atrium and the right ventricle. The membranes are connected to flaps of muscle called the papillary muscles by tendons called the "heartstrings." Make an incision down through the pulmonary artery and look inside it for three small membranous pockets. These form the pulmonary semilunar valve which prevents blood from flowing back into the right ventricle. Insert your dissecting scissors or scalpel into the left atrium at the base of the aorta and make an incision down through the wall of the left atrium and ventricle, as shown by the dotted line in the external heart picture. Locate the mitral valve (or bicuspid valve) between the left atrium and ventricle. This will have two flaps of membrane connected to papillary muscles by tendons. Make an incision up through the aorta and examine the inside carefully for three small membranous pockets. These form the aortic semilunar valve which prevents blood from flowing back into the left ventricle. Aorta The two vena cava go into the right atrium on the other (dorsal) side Pulmonary artery The pulmonary vein goes into the left atrium on the dorsal side. Coronary artery and vein When you need to see inside the right ventricle, cut here. When you want to open the left ventricle cut here. 1. Fill up the table: Structure Table 2. Summary of lengths of organs of the rabbit’s digestive system. Thickness of the wall (mm ±1) Ranges Average Minimum Maximum (mm±0,1) Group 1 Group 2 Group 3 Group 4 Group 5 value value Aorta Pulmonary Artery Right atrium Left atrium Right Ventricle Left Ventricle 1. Make a graph where you compare the thickness of the walls of the structures included in the table 2. Your graph should include the ranges (minimum and maximum) of the measurements done for the cow’s heart in Biology Lab. Also, it should include all the appropriate titles. 2. Which chamber of the heart has the thickest walls? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. Which blood vessel directly supplies the heart muscle with blood? . . . . . . . . . . . . . . . . . . . . . . . . 4. How is the wall of the atria different from the wall of the ventricles? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. How are the walls of the left ventricle different from the walls of the right ventricle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. How are the walls of the arteries different from the walls of the veins? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .