PHYSIOL 1 Lecture Notes - Lecture 25: Intercalated Disc, Qrs Complex, Membrane Potential
Document Summary
Heart is enclosed in fibrous sac known as pericardium. Walls of heart (myocardium): are cardiac muscle cells. Chambers and vessels are lined by endothelium (endocardium) Heart is divided into let and right halves. Each with an atrium and a ventricle. (interventricular) septum separates the right heart and left heart. Valves: control the direction of blood flow through heart (very very low resistance) Passive: opened and closed solely due by pressure differences. Atroventricular (av) valves separate the atria and ventricles. Left av valve: bicuspid valve, mitral valve. Know the pathway of blood through the heart pulmonary trunk) Goes to right ventricle (through right av valve) From right ventricle blood goes to pulmonary artery (going through pulmonary semilunar valve) From pulmonary artery it goes to pulmonary arterioles. From pulmonary arterioles blood goes to capillaries of lungs. Blood from capillaries goes to pulmonary veinuoles. From pulmonary veinuoles blood drains to pulmonary veins.
