In the part of the graph labeled A, the vessels involved are the Arterioles.
- During systemic circulation, the blood leaves the left ventricle into the Aorta. The Aorta supplies the Arteries from where the blood travels through the Arteries into the Arterioles.
- The vessel in label B is the veins. From the capillaries to the veins, the blood flows under lower pressure than the previous vessels and into the vena cava.
- From the Vena Cava, the blood moves back into the right ventricle as the pressure ups slightly. When the blood gets to the right ventricle, the pulmonary system has started and the systemic circulation has ended. Then the blood moves into the Lungs (Label C) from the pulmonary arteries. In the lungs the blood is re-oxygenated.
- From the lungs, the rich oxygenated blood is pumped through Label D - the Left Ventricles into all other tissues in the body.
In summary, the labels are as follow:
A. Arterioles.
B. Veins
C. Pulmonary Arteries
D. Left Ventricles
Learn more about the human circulatory system in the link below:
https://brainly.com/question/8003743
