The Respiratory System

Multiple Choice

The respiratory system

A) obtains O₂ from and eliminates CO₂ to the internal environment
B) includes the heart and lungs
C) helps regulate the pH of the internal environment by removing acid-forming CO₂ from the blood
D) all of the these
E) obtains O₂ from and eliminates CO₂ to the internal environment and helps regulate the pH of the internal environment by removing acid-forming CO₂ from the blood