4 blood vessels
- 4 blood vessels in umbilical cord
- 4 blood vessels of the heart
- 4 blood vessels connected to the heart
- 4 blood vessels that enter the left atrium
- 4 major blood vessels of the heart
- 4 major blood vessels
- 4 types of blood vessels
- 4 innermost lining of blood vessels
- 4 major blood vessels of the heart and their functions
- 4 main blood vessels of the heart
- 4 main blood vessels
- 4 main blood vessels attached to the heart
- 4 major blood vessels connected to the heart
- 4 great blood vessels of the heart
- 4 major blood vessels of the brain