A) Pulmonary arteries
B) Pulmonary veins
C) Systemic arteries
D) Systemic veins

A) 1
B) 10
C) 100
D) 1000

A) simple pathway, as one artery delivers blood and one vein drains the organ.
B) simple pathway, as its two capillary beds are separated by a portal vein.
C) anastomosis, as one artery delivers blood and one vein drains the organ.
D) anastomosis, as its two capillary beds are separated by a portal vein.