Lecture -BJP-Cardiac and Neck Vessels 9.09

Lecture -BJP-Cardiac and Neck Vessels 9.09 - Curry College...

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Curry College Division of Nursing NSG 2002-Introduction to Health Assessment Heart & Neck Vessels
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Cardiac - definitions n Pericardium n Apical impulse n Precordium n Mediastinum n Great Vessels
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Heart Structures n Pericardium n Tough sac, attaches to the great vessels. n 2 layers, pericardial fluid in between (surrounds and protects heart) n Myocardium n muscular wall-thickest layer of the heart n Endocardium n Inner most layer-lines chambers and valves
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Chambers n Four chambers n Right and Left Atria n Right and Left Ventricles n Septum n separates right and left sides of the heart
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Valves n Atrioventricular{AV} (entrance into the ventricles) n Bicuspid (mitral) n Tricuspid n open during diastole, allows blood to flow from atria to ventricles n close just prior to V contraction (start of systole), prevents backflow of blood (S1)
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Valves n Semilunar{SL} (exit from the ventricles) n Pulmonic on right (RV and pulmonary artery) n Aortic on left (LV and aorta) n closed during diastole to allow filling of ventricles n open during systole - allows outflow from ventricles - shut at very end of systole or start of diastole (S2)
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Figure 17-4. p. 500. Internal Anatomy of Heart
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Electrical Conduction System of Heart n The normal heart rate is 60 to 100.This is the pace set by the SA Node. n If SA node fails, AV node must take over, the rate drops to between 40 to 50. n If both the SA and the AV nodes fail a pacemaker site in the ventricle will fire at 30 to 40 bpm.
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Figure 17-8. p. 505. Conduction System of Heart Electrical impulses are recorded as they leave the heart and travel through the surrounding tissue. The result is a “wave” that is printed on ruled paper and represents the cardiac cycle
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The filling and emptying of the heart’s chambers n It has two phases. n Diastole- relaxation of the ventricles (filling with blood). n Systole-contraction of the ventricles (emptying of blood). Ventricular inflow. AV valves shut (S1).
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This note was uploaded on 04/01/2012 for the course BIOL 202 taught by Professor Buckley during the Spring '12 term at University of Massachusetts Boston.

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Lecture -BJP-Cardiac and Neck Vessels 9.09 - Curry College...

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