PLN 203 Lecture Notes - Lecture 4: Pulmonary Artery, Pulmonary Vein, Pulmonary Circulation
6 Mar 2017
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Document Summary
Pulmonary: carries blood to and from the lungs. Systemic: carries blood to and from the body. Blood alternates from systemic and pulmonary circuit. Carries blood away from heart: veins. Exchanges material (gases, nutrients, waste products) between blood and tissues. Collects blood from systemic circuit: right ventricle. Pumps blood to pulmonary circuit: left atrium. Collects blood from pulmonary circuit: left ventricle. Sits between 2 pleural cavities in the mediastinum. Parietal pericardium: outer layer: forms inner layer of pericardial sac. Pericardial cavity: between the parietal and visceral layer: contains pericardial fluid. Pericardial sac- fibrous tissue: surrounds and stabilizes the heart. Superficial: atria, thin wall, expandable outer auricle, sulci, coronary sulcus divides the atria and ventricles, anterior interventricular sulcus and posterior interventricular sulcus, separates left and right of the heart, contains blood vessels of the cardiac muscle. Inner layer: simple squamous epithelium, areolar tissue. Interconnect cardiac muscle cells: secured by desmosomes. Linked by gap junctions: convey force of contraction, propagate ap.
