In animals with a closed circulatory system, gas exchange occurs across the thin walls of ________.
A)arteries
B)arterioles
C)capillaries
D)venules

Question

Quizplus · Accepted Answer

In animals with a closed circulatory system, gas exchange occurs across the thin walls of capillaries, which are the smallest blood vessels and have walls thin enough to allow for the exchange of gases, nutrients, and waste products between blood and tissues.

In Animals with a Closed Circulatory System, Gas Exchange Occurs