HTHSCI 2FF3 Lecture Notes - Lecture 5: Thoracic Cavity, Great Vessels, Aorticopulmonary Septum
1 Nov 2016
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Heart sounds are generated when the blood is forced against the closed cusps. The best place to hear sounds is away from the cusps listen for echo. Erb"s point: listen to both aortic and pulmonary learn the acronym and positions. When the ventricles are contracting, you might think that coronary blood supply increases in fact it decreases, as the coronary arteries also contracts decreasing the volume of blood going to the myocardium. The volume of blood actually increases when the ventricles relax. If a segment of papillary muscle is damaged, the cusps will evert allowing for blood regurgitation back into atria i. e. mitral valve regurgitation. It is the left side systemic circulation that is concerned with waste removal. There were some key differences in fetal life, oxygen exchange occurs at the placenta. No distinction of blue and red (which indicates oxygenated blood). Shunts and bypasses which allow us to move oxygenated blood to the key body tissues in the fetus.
