The Cardiovascular System Chapter 15
Heart is two pumps in one: Right side – pulmonary circulation Left side – systemic circulation Heart→ Arteries → Arterioles → Capillaries → Venules→ Veins → Heart Artery – any vessels that carries blood away from the heart. Vein – any vessels that carries blood toward the heart
Parietal pericardium: outer fibrous layer inner serous layer Pericardial cavity Visceral pericardium (epicardium) Pericarditis Cardiac Tamponade
Heart Wall 3 Layers: Epicardium – serous membrane Myocardium – muscle layer Endocardium – continuous throughout circulatory system
Cardiac Muscle : involuntary, striated Intercalated discs: gap junctions functional syncytium desmosomes – “spot welds”
Conduction system of the heart Sinoatrial (SA) node – “pacemaker’ → Atrioventricular (AV) node → Atrioventricular (AV) Bundle - Bundle of His→ Purkinje fibers – conduction myofibers