The functions of the respiratory system are ( Select all that apply )

Answer 1

1) Breathing or ventilation: The respiratory system allows the exchange of oxygen and carbon dioxide between the body and the atmosphere. It includes inhalation, where oxygen is taken in, and exhalation, where carbon dioxide is expelled.

2) Gas exchange: The respiratory system facilitates the transfer of oxygen from the inhaled air into the bloodstream and the release of carbon dioxide from the bloodstream into the exhaled air. This gas exchange occurs in the lungs, specifically in the tiny air sacs called alveoli.

3) Oxygen transport: Once oxygen enters the bloodstream through the lungs, it binds to red blood cells and is transported to various organs and tissues in the body to support metabolic activities.

4) Removal of carbon dioxide: Generated as a waste product of cellular respiration, carbon dioxide is carried by the bloodstream back to the lungs and then eliminated from the body during exhalation.

5) pH regulation: The respiratory system plays a role in maintaining the acid-base balance or pH levels of the blood. By breathing faster or slower, the body can adjust the levels of carbon dioxide in the blood, which in turn affects the pH balance.

6) Voice production: The respiratory system controls the flow of air through the vocal cords, allowing us to produce sounds and speak.

7) Sense of smell: The respiratory system houses olfactory receptors that detect odor molecules in the air, enabling the sense of smell.

8) Defense against pathogens: The respiratory system has mechanisms to trap and remove foreign particles, such as dust or pathogens, preventing them from entering the lungs and causing infection.