Lab 3 A&P11; Don\'t squeeze too vigorously or water will exit through the arteri
ID: 136015 • Letter: L
Question
Lab 3 A&P11; Don't squeeze too vigorously or water will exit through the arteries and make a huge mess! Drain the water from the ventricle. 6. Locate the pulmonary trunk (Is it an artery or a vein and how can you tell?) 7. Cut through its anterior wall until you can see the pulmonary semilunar valve. Pour or squeeze some water onto the pulmonary semilunar valve to observe the action of this valve. Record your observation and describe how its action differs from the AV valve. 8. Drain the water out of the heart and continue to the cut made in the wall of the vena cava through the right atrium and right AV valve into the right ventricle. Continue cutting parallel to the border of the intraventricular septum. Reflect the cut ed so that you can view the inside of the right side of the heart. Just below the inferior vena cava opening, identify the opening of the coronary sinus, which returns venous blood of the coronary circulation to the right circulation. Identify the nearby oval depression called the fossa ovalis. What is the functional significance of this structure? ges 9. Identify the papillary muscles in the right ventricle, and follow their attached chordae tendineae to the flaps of the AV valve. What is the function of these structures?Explanation / Answer
6. Pulmonary trunk is a major vessel of circulatory system that originates from the right ventricle of the heart. It is an artery as it further branches into right and left pulmonary arteries. These are the only arteries that carry deoxygenated blood instead of oxygenated blood to lungs.
7. The AV valves function by preventing the backflow of blood from ventricles back to auricles. This leads to first heart sound called 'LUBB'. The semilunar valves function by stopping the .flow of blood back to ventricles. This leads to second heart sound called 'DUBB'.
8. During foetal development, the foetus receives oxygenated blood from the mother and lungs are non functional. The fossa ovalis is open known as the foramen ovale which helps in passage of blood from right auricle to left auricle. After birth the foramen ovale closes and is called fossa ovalis. It divides the heart into right and left auricles and hence helps in efficient circulation of blood.
9. Papillary muscles are located in the ventricles of heart and prevents backward flow of ventricular blood in auricles. They act as site of attachment of chordae tendinae. These are heart strings that helps in holding the AV valves in place while the heart is pumping blood.
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