What are the only two places in the entire circulatory system at which gas exchange can take place?
A)pulmonary and cardiac capillaries
B)pulmonary and the systemic capillaries
C)bronchioles and alveoli
D)arterial and venous capillaries
E)arteries and veins

Question

What are the only two places in the entire circulatory system at which gas exchange can take place?​
A)​pulmonary and cardiac capillaries
B)pulmonary and the systemic capillaries
C)bronchioles and alveoli
D)arterial and venous capillaries
E)​arteries and veins

Quizplus · Accepted Answer

Gas exchange can occur only at two sites in the circulatory system – in the pulmonary capillaries where oxygen is loaded and carbon dioxide is unloaded, and in the systemic capillaries where oxygen is unloaded and carbon dioxide is loaded. Option A is incorrect because cardiac capillaries don't take part in gas exchange. Option C is incorrect because bronchioles only transport air and don't participate in gas exchange. Option D is incorrect because arterial and venous capillaries don't perform gas exchange. Option E is incorrect because arteries and veins only carry blood to and from different parts of the body, respectively.

What Are the Only Two Places in the Entire Circulatory System