Multiple Choice
Countercurrent exchange is evident in the flow of ________.
A) water across the gills of a fish and the blood within those gills
B) blood in the dorsal vessel of an insect and that of air within its tracheae
C) air within the primary bronchi of a human and the blood within the pulmonary veins
D) water across the skin of a frog and the blood flow within the ventricle of its heart
Correct Answer:
Verified
Correct Answer:
Verified
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