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FCPS Medicine01
Cardiology
Question | Answer |
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The heart acts as two serial pumps that share | several electrical and mechanical components. |
The right heart circulates blood to the lungs | where it is oxygenated |
the left heart receives this and | circulates it to the rest of the body . |
The atria are thin walled structures that | act as priming pumps for the ventricles, which provide most of the energy to the circulation. |
Within the mediastinum, the atria are situated posteriorly and the left atrium (LA) | sits anterior to the oesophagus and descending aorta. |
The interatrial septum separates | the two atria |
In 20% of adults, | a patent foramen ovale is found |
this communication (patent foramen ovale)in the fetal circulation | between the right and left atria normally closes at birth. |
The right atrium (RA) receives blood from the superior and | inferior venae cavae and the coronary sinus. |
The LA receives blood from four pulmonary veins | two from each of the left and right lungs. |
The ventricles are thick-walled structures, adapted to | circulating blood through large vascular beds under pressure. |
The atria and ventricles are separated by | the annulus fbrosus |
the annulus fbrosus which forms the skeleton for the atrioventricular (AV) valves | and which electrically insulates the atria from the ventricles. |