The Cardiovascular system - Coronary arteries

Question 1

What forms the left and right coronary arteries?

Answer 1

Arise from the left and right aortic sinuses within the aorta.

Question 2

What are the aortic sinuses?

Answer 2

The aortic sinuses are small openings found within the aorta behind the left and right flaps of the aortic valve. When the heart is relaxed, the back-flow of blood fills these valve pockets, therefore allowing blood to enter the coronary arteries.

Question 3

What does the left coronary artery branch into?

Answer 3

1. Anterior interventricular branch
2. Left marginal artery
3. Left circumflex artery

Question 4

What does the right coronary artery branch into?

Answer 4

1. Right marginal artery

2. Posterior interventricular artery