ANAT 216 Lecture Notes - Lecture 9: Cardiac Muscle Cell, Sliding Filament Theory, Ventricular Fibrillation
12 Nov 2016
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Document Summary
Cardiovascular system: heart 2 (reading material: chapter 21: pages 550-552; 561-566) Cardiac muscle forming the bulk of the heart wall. So the cardiac muscle is arranged in circular groups. These interlocked bundles effectively lace all parts of the myocardium together. The significant is that when the heart contracts, there is a slight twisting movement that helps with the fxn of heart. Endothelium lining the inside of the heart. myocardiocytes together. Also plays a supporting role strengthening the tissue in those particular areas of the heart. If there wasn"t additional strength to these areas they would be overly stretched because of the force of the blood being pushed through the vessels to the valves. fibrous skeleton (fibrous ring structure): the connective tissue linking endocardium. Cardiac muscle fibers (myocardiocytes): very similar to skeletal muscle cell. Means it occurs without neural or hormonal stimulation although these things can affect heart rate. involuntary cant consciously control contractile activity.
