HTHSCI 1H06 Lecture Notes - Lecture 3: Limbic System, Circulatory System, Superior Vena Cava
23 Feb 2017
School
Department
Course
Professor
Document Summary
What happens to coronary blood flow when it is relaxing, when it is in diastole, and when it is contracting (when in systole): In the sulci where the coronary arteries lie they do protect the coronary arteries moving around when the heart is contracting and relaxing. However, the coronary arteries will get compressed during contraction. During relaxation when the pressure is released and they can start to dilate. When we looked at the papillary muscle. It is an extension of the trabeculae carneae. It attaches to these parachutes like cords (chordae tendinae) It is a subvalvular apparatus, papillary muscle & chordae tendinae that hold it all together. When it is attached to the valves like a parachute. Therefore, when blood catches during ventricular contraption up under the cusps it makes the cusps form the material part of the parachute. The chordae tendinae become taut as they are put under tension due to contraction of the papillary muscles.
