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GRCC AD 155 Unit II
grcc ad 155 Cardiac anatomy
| Question | Answer |
|---|---|
| Heart size | hollow, cone shaped and the size of an adult fist (1 lb) |
| Heart location | mediastinum of the thoracic cavity, between the vertebral column and the sternum. |
| This is flanked laterally by the lungs and lies 2/3 to the left of the sternum | heart location. |
| Heart protective covering | pericardium- snug fit helps keep it from overfilling with blood. |
| The pericardium is a double layer | parietal pericardium & visceral pericardium (epicardium) |
| Parietal pericardium | Outermost layer |
| Visceral pericardium (aka epicardium) | adheres to the heart surface |
| Layers of the heart muscle | epicardium, myocardium, endocardium |
| Epicardium | outside layer of heart, covers entire heart and great vessels then folds over to form the parietal layer. |
| The epicardium covers the entire heart and great vessels, then folds over to form what? | The parietal layer that lines pericardium and adheres to heart surface. |
| This is the middle layer of the heart wall | the myocardium |
| the myocardium consists of | specialized muscle cells (myofibrils) provides bulk of contractile heart muscle. |
| Innermost layer, thin membrane composed of 3 layers. | endocardium |
| The endocardium is made up of | smooth endothelial cells that line the inside of the heart's chambers and great vessels. |
| AV valves tricuspid | on the right is seperates right atria from rt ventricle |
| AV valves Bicuspid | on the left |
| Semilunar valves | pulmonary and aortic |
| pulmonary | joins rt ventricle with pulmonary artery. |
| Aortic | joins left ventricle to the aorta. |
| SI sound | systole |
| Systole = | contraction (S1 sound) |
| what is characterized as the LUB | SI (first heart sound/contraction) |
| What is the LUB sound produced by? | the closure of the av valves (tricuspid & bicuspid) |
| the lub sound is when which valve closes and the action that is occuring | closure of the AV valve and contraction |
| What is the second heart sound? | S2 |
| S2 = | diastole (relaxation) |
| diastole | relaxation |
| Characterized by Dub | S2 - second heart sound |
| what is the dub sound produced by? | the closure of the semilunar valves (Aortic valve, pulmonary valve) |
Created by:
Wends1984
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