BISC 3221 Chapter 21: Chapter 21 Notes- The Heart
16 Aug 2018
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Intercalated discs: specialized cell junction of cardiac muscle tissue; interlocking of opposing cell membranes + cell junctions. Isolate atrial muscle cells from ventricular muscle cells in order to coordinate cardiac contractions. 21. 4 orientation and superficial anatomy of the heart: heart is located within mediastinum, base: broad superior portion of heart, attached to major arteries/veins. Inferior border: formed by inferior wall of right ventricle inferior wall of left ventricle. 21. 5 internal anatomy and organization of the heart: atria are separated by interatrial septum; ventricles by interventricular septum. 3: valves: folds of endocardium that extend into openings between atria and ventricles; one way flow, prevent backflow, functional demands on 2 atria are almost the same; on ventricles, significantly different. The right atrium: superior vena cava and inferior vena cava bring o2 poor blood from systemic circuit to the heart, superior vena cava delivers blood from had, neck, upper limbs, chest.
