The functions of the respiratory system are:
1. Allows for the breathing in of oxygen: The primary function of the respiratory system is to inhale oxygen from the air and deliver it to the body's cells for energy production through a process called respiration.
2. Removes carbon dioxide from the body: Along with taking in oxygen, the respiratory system also expels carbon dioxide, which is a waste product of cellular metabolism, from the body through exhalation. This helps maintain the body's acid-base balance.
Therefore, the correct functions of the respiratory system from the options given are C. Allows for the breathing in of oxygen and D. Removes carbon dioxide from the body.
