| Question | Answer |
| The heart is a | 4 chambered muscular organ |
| What is the location of the heart | It lies in mediastinum with apex on diaphragm 2/3 of its bulk to the left of midline of body & 1/3 to right |
| How do you count apical beat | by placing stethoscope in 5th intercostal space on line with left midclavicular point |
| What is the loose-fitting inextensible sac is around the heart | fibrous pericardium |
| What is the layer that is lined with serous percadium, which also covers the outer surface of the heart | Parietal layer |
| The outer surface of the heart | Visceral Layer or Epicarduim |
| what is the small space btwn parietal & visceral layers of serous pericardium contain what? | few drops of pericardial fluid |
| What is the function of the covering | To protect against friction |
| What are the walls of the heart are ?? | epicardium, myocardium(muscular wall), endocardium (lining) |
| what allows the intercalated discs to directly contact btwn cells & muscle action potentials to spread from one fiber to another | Myocardium(muscular wall) |
| Cavaties are formed by ?? | 2 atria, 2 ventricles |
| Atria are separated by what ?? | interatrial septum which contain fossa ovalis |
| ventricles separated by ?? | interventricular septum |
| Ventricles have irregular folds called?? | Trabeculae carneae |
| Atria has folds called?? | pectinate muscles |
| What are between atria & ventricles | atrioventricular AV oriffices |
| AV is guarded by | cuspid valve |
| Cuspid valve has 3 parts?? | flaps, chordae tendinae & papillary muscle |
