The two organs that play an important role in maintaining acid-base balance are the
A) liver and gallbladder.
B) liver and kidneys.
C) heart and lungs.
D) lungs and kidneys.
E) heart and liver.
Question 2
The ________ circuit carries blood to and from the lungs.
A) pulmonary
B) systemic
C) oxygen
D) portal
E) primary