7 Questions
Which arteries supply the heart?
Coronary arteries
Which artery supplies the sinoatrial node?
SA nodal artery
Which artery supplies the left anterior descending artery?
Left main coronary artery
Which artery supplies the posterior descending artery?
Atrioventricular nodal artery
What determines the dominance of circulation?
Whether the RCA or LCx supplies the PDA
What percentage of people have right-dominant circulation?
80%
Where does venous blood from the heart drain into?
RA
Study Notes
- The heart is supplied by the right and left coronary arteries.
- The right coronary artery supplies the acute marginal branches, atrioventricular nodal artery, and posterior descending artery.
- The left main coronary artery supplies the left anterior descending artery, septal branches, and circumflex artery.
- The sinoatrial node is supplied by the SA nodal artery, which may arise from the RCA or LCA.
- Venous blood from the heart drains into the RA through the coronary sinus.
- Dominance of circulation is determined by whether the RCA or LCx supplies the PDA.
- Right-dominant circulation occurs in 80% of people.
- Left-dominant circulation occurs in 15% of people.
- Balanced circulation occurs in 5% of people.
- The physiologic R-L shunt is contributed to by a small amount of venous blood that drains through Thebesian veins into all four chambers.
Test your knowledge of the heart's blood supply and circulation with this informative quiz! Learn about the right and left coronary arteries, their branches, and the dominance of circulation. Discover the role of the sinoatrial node and the importance of the coronary sinus in venous drainage. Challenge yourself with questions on the physiologic R-L shunt and more. Sharpen your understanding of this vital organ and its intricate system with this engaging quiz.
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