9.2 Heart

The mammalian heart — 4 chambers, valves between every section, septum keeps oxygenated and deoxygenated blood separate, and tiny coronary arteries on the surface feed the heart muscle. Coronary heart disease (CHD) results from blockage of coronary arteries; risk factors split into modifiable (diet, exercise, smoking, stress) and non-modifiable (age, sex, genetics). HL extends to AV vs semilunar valves, why the LV wall is thicker than the RV, and the role of the septum.