Circulatory System. Circulatory system consists of:. Heart Blood Vessels Blood. Closed System in Humans. Arteries, Arterioles, Capillaries, Venules , Veins. Heart. Artery. Vein. Capillary. Venule. Arteriole. Portal Vein. Has capillaries at both ends E.g. hepatic portal vein
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Has capillaries at
E.g. hepatic portal vein
from intestine to liver
Very thin wall
What causes a pulse?
The expansion of an artery due to the pumping of the heart
What is blood pressure?