Want this question answered?
dusk
Cerebral arterial circle AKA Circle of Willis
More oxygen, for the pumped blood circle through the body and the body consumes more oxygen and carries more oxygen than it carries carbon-dioxide.
The proximal part of the posterior cerebral artery is narrow and its ipsilateral posterior communicating artery is large, so the internal carotid artery supplies the posterior cerebrum.
The circulatory system does create, essentially, one or two large loops in the body. Blood moves from the left ventricle to the systemic arteries, then capillaries, then veins of the systemic circulation. Blood returns from the systemic circulation to the right atrium, then right ventricle, then to the pulmonary artery. It goes to the lungs and returns to the left atrium via the pulmonary veins.
The vertebral arteries merge to form a basilar artery which form the posterior Circle of Willis. The middle cerebral arteries form the rest of the Circle of Willis.
The left and right corotid arteries and the vertebral arteries which join together to form the basilar artery (forming the circle of willis).
Pulmonary veins are oxygen rich and deliver it along with nutrients to the body's organs, after the blood has delivered the goods then it is drained back to the heart by the arteries. Then the blood is carried back to the lungs to the alveoli for gas exchange leave carbon dioxide we breathe out and pick up new oxygen and starts over again. Blood flow goes as follows: 1. left atrium 2. mitral (bicuspid) valve 3. left ventricle 4. aortic semilunar valve 5. aorta 6. brachiocephalic trunk 7. common carotid arteries 8. internal carotid artery 9. anterior and middle cerebral arteries 10. Circle of Willis 11. venous sinuses internal jugular vein 12. right brachiocephalic vein 13. superior vena cava 14. right atrium 15. tricuspid valve 16. right ventricle 17. pulmonary semilunar valve 18. pulmonary trunk 19. pulmonary artery (Please leave personal comments on the discussion pages.)
a hemisphere
semicircleA half circle is called a semicircle.Half a circle is a semi-circle
A part of a circle between two points on a circle is called is called an arc.
Half a circle is called a semi-circle. Sometimes it is called a half-moon.