In a circulatory system with double circulation, __________.
a. blood is pumped at two separate locations as it circulates through the body
b. blood is pumped twice by the same heart in order to complete a cycle of picking up oxygen and delivering it to the tissues
c. there is a countercurrent exchange in the gills
d. hemolymph circulates both through a pumping blood vessel and through body sinuses
e. there are always two atria per heart ventricle
Answer: b. blood is pumped twice by the same heart in order to complete a cycle of picking up oxygen and delivering it to the tissues
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