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12 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Right heart |
Pumps blood through lungs |
Pulmonary circulation |
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Left heart |
Pumps blood through systemic circulation. Serial connection with right heart. The output of one becomes the input of the other |
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Mediastinum |
Area above the diaphragm and between the lungs, the heart lies obliquely in this area. |
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Three layers of heart wall |
Pericardium, myocardium, endocardium |
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Pericardium |
Double walled membranous sac that encloses the heart. Prevents gravitational displacement of heart. Physical barrier that protects against infection and inflammation from lungs and pleural space. Pain receptors and mechanoreceptors to cause reflex changes in BP and heart rate. |
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Two layers of pericardium |
Parietal and visceral pericardia separated by fluid containing space called the pericardial cavity |
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Pericardial fluid (10-30 mL) |
Secreted by mesothelial cells, lubricates the membranes lining pericardial cavity. Amount and character changed by inflammation. |
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Myocardium |
Thickest layer of heart wall, composed a cardiac muscle and anchored to the heart's fibrous skeleton. |
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Endocardium |
Connective tissue and squamous cells. Internal lining of myocardium, continuous with endothelium that lines arteries, veins, capillaries, creates a continuous and closed circulatory system. |
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Annuli fibrosi cordis |
4 adjacent, central rings of dense fibrous connective tissue, provide firm anchorage for attachments of atrial and ventricular musculature, and valvular tissue. |
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Ventricular relaxation |
Atrioventricular valves open, blood flows from atria to the relaxed ventricles |
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Ventricular contraction |
Increasing ventricular pressure causes AV valves to close and prevents backflow into the atria. |
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