Heart located in thoracic cavity between lungs, about fist size. Heart surrounded by pericardium with three layers. Heart wall consists of epicardium, myocardium, and endocardium. Left ventricle has thicker muscle than right ventricle
Located in upper back wall of right atrium, 15mm long and 3mm wide. Contains pacemaker cells, smaller than surrounding atrial cells. Receives blood supply from sinoatrial nodal artery, usually from right coronary artery. Cells surrounded by connective tissue and paranodal cells for insulation
Coronary sulcus separates atria from ventricles on heart surface. Contains nutrient vessel trunks and coronary sinus. Extends from 3rd left to 6th right costal cartilage. Epicardial fat concentrates along coronary sulcus
Ventricles are two large chambers located at heart's bottom. Right ventricle pumps blood to lungs, left ventricle to body. Ventricles have thicker walls than atria and generate higher blood pressure. Left ventricle averages 143g, right ventricle equals size
Heart is located in mediastinum between lungs, size of fist. Divided into four chambers: two atria and two ventricles. Surrounded by pericardium sac containing fluid. Heart wall has three layers: epicardium, myocardium, and endocardium
Heart is a fist-sized muscular organ located in thoracic cavity. Heart sits within fluid-filled pericardial cavity lined by pericardium. Heart has three layers: epicardium, myocardium, and endocardium. Heart has four chambers: two atria and two ventricles