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341 Chpt 14
The Heart
| Question | Answer |
|---|---|
| Heart location | Thoracic cavity, 2/3 left, inside mediastinum |
| Apex | Inferior, anterior, and left |
| Base | Superior, posterior, right |
| Functions of heart | pump blood through vessels, and produce horomones |
| How many layers does pericardium have? | Three: fibrous pericardium, serous pericardium parietal layer, serous pericardium visceral layer |
| Fibrous pericardium | Dense irr. c.t. attached to diaphragm and large blood vessels, not elastic |
| Serous pericardium parietal layer | attached to fibrous pericardium |
| Serous pericardium visceral layer | attached to surface of the heart |
| Pericardial fluid function | To decrease friction during heartbeat |
| What is between layers of the heart? | Pericarial fluid |
| Myocardium | Cardiac muscle cells, joined by intercalated disks |
| Endocardium | Inner lining of heart made up of epithelial tissue and c.t. that seperates blood from muscle |
| Right atrium | Recieves blood from body |
| Left atrium | Recieves blood from lungs |
| Auricle | Pouch near top of atria to increase volume |
| Pectinate Muscle | Ridgid walls especially in auricles |
| Sinoatrial node | Special bundle of modified cardiac cells "pacemaker" |
| Trabeculae carneae | Ridges of muscle in the ventricles |
| Chordae tendineae | Tendon-like cords that attach to bottoms of bicuspid and tricuspid valves and then to the papillary muscles |
| When moving blood from atria to ventricles | AV valve open and SL valves closed |
| Moving blood from ventricles to body | AV valves close and SL valves open |
| Coronary artery | Artery that carries blood to cardiac cells |