PLN 103 Lecture Notes - Lecture 2: Interventricular Septum, Elastic-Rebound Theory, Connective Tissue
11 Mar 2017
School
Department
Course
Professor
Document Summary
Left ventricle is a lot more thick then right ventricle. Both ventricles become thicker as they dilate. 2 pairs of one way valves: prevents backflow of blood. Av valve: between atria and ventricles, blood pressure closes the valve during ventricular contractions, papillary muscles tense chordae tendineae to prevent valves from swinging into atria. Semilunar valve: pulmonary and aortic tricuspid valve, prevents backflow from pulmonary trunk and aorta into ventricles, no muscular support, 3 cusps. Aortic sinuses: at the base of ascending aorta, sacs that prevent valve cusps from sinking to aorta, origin of right and left coronary arteries. When ventricles are relaxed, the av valves are open and the semilunar valves closed: chordae tendineae are loose and the papillary muscles are relaxed. When the ventricles are contracting, the av valves are closed, and the semilunar valves open: left av valve connected to the chordae tendineae and papillary muscles.
