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341 Chpt 14

The Heart

QuestionAnswer
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
Created by: Kayerenee