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a system of veins which carries blood from the digestive tract to the liver.
animals that lack a cavity between the digestive tract and the outer body wall.
outgrowths of neurons (nerve cells) that transmit nerve impulses towards the cell body.
a system of support in soft-bodied animals, which relies on pressure of fluids in the body...
a cluster of capillaries situated inside Bowman's capsule in the nephron.